Skin & Rashes

My Baby Has a Waxy Yellowish Patch on Their Scalp (Nevus Sebaceous)

Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician

Content reviewed against published AAD, NIH, DermNet guidelines

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Baby skin is sensitive and changes frequently. If you are noticing has a waxy yellowish patch on their scalp (nevus sebaceous), here is what you need to know.

The short answer

A nevus sebaceous (also called nevus sebaceous of Jadassohn) is a benign birthmark that typically appears on the scalp as a flat or slightly raised, yellowish-orange, waxy or velvety patch where hair does not grow. It is present at birth and occurs in about 0.3% of newborns. During childhood, it remains relatively flat and inconspicuous. At puberty, it becomes thicker and more noticeable due to hormonal stimulation. There is a small risk (historically overstated) of developing benign or rarely malignant tumors within the nevus later in life, so monitoring and potential removal are discussed with your dermatologist.

Key takeaways

  • A nevus sebaceous (also called nevus sebaceous of Jadassohn) is a benign birthmark that typically appears on the scalp as a flat or slightly raised, yellowish-orange, waxy or velvety patch where hair does not grow. It is present at birth and occurs in about 0.3% of newborns. During childhood, it remains relatively flat and inconspicuous. At puberty, it becomes thicker and more noticeable due to hormonal stimulation. There is a small risk (historically overstated) of developing benign or rarely malignant tumors within the nevus later in life, so monitoring and potential removal are discussed with your dermatologist.
  • Usually normal when: Your baby has a flat, yellowish, hairless patch on the scalp that is not growing or changing — this is typical for nevus sebaceous in childhood
  • Call your doctor if: A rapidly growing nodule develops within the nevus sebaceous — this needs prompt dermatologic evaluation to rule out a secondary tumor
  • Varies by age — see the age-by-age breakdown below
Eczema is very common in babies and children. About 1 in 10 children will develop eczema, typically starting in the first few months of life.
Eczema in Babies and Children, American Academy of Pediatrics (AAP)

This is one of the most common questions parents ask. Searching for answers means you care.

What Parents Should Know

According to AAD, NIH, DermNet guidelines, a nevus sebaceous (also called nevus sebaceous of Jadassohn) is a benign birthmark that typically appears on the scalp as a flat or slightly raised, yellowish-orange, waxy or velvety patch where hair does not grow. It is present at birth and occurs in about 0.3% of newborns. During childhood, it remains relatively flat and inconspicuous. At puberty, it becomes thicker and more noticeable due to hormonal stimulation. There is a small risk (historically overstated) of developing benign or rarely malignant tumors within the nevus later in life, so monitoring and potential removal are discussed with your dermatologist. At 0-6 months, in newborns and young infants, a nevus sebaceous typically appears as a flat or slightly raised, smooth, hairless patch on the scalp. It may be yellow, orange, or tan in color. It is painless and does not itch. Your pediatrician may recognize it on examination. A referral to a pediatric dermatologist can confirm the diagnosis. No treatment is needed in infancy. It is generally considered normal when your baby has a flat, yellowish, hairless patch on the scalp that is not growing or changing — this is typical for nevus sebaceous in childhood. However, you should contact your pediatrician promptly if a rapidly growing nodule develops within the nevus sebaceous — this needs prompt dermatologic evaluation to rule out a secondary tumor.

Sources: [1], [2], [3]

Normal vs. Concerning

Usually Normal
Worth Discussing
Your baby has a flat, yellowish, hairless patch on the scalp that is not growing or changing — this is typical for nevus sebaceous in childhood
A rapidly growing nodule develops within the nevus sebaceous — this needs prompt dermatologic evaluation to rule out a secondary tumor
Your child's nevus sebaceous has been evaluated by a dermatologist and monitoring has been recommended
The lesion bleeds persistently or develops an ulcer that does not heal
The patch is stable and asymptomatic
The nevus sebaceous changes in texture, color, or size before puberty

By Age

What to expect by age

0-6 months

In newborns and young infants, a nevus sebaceous typically appears as a flat or slightly raised, smooth, hairless patch on the scalp. It may be yellow, orange, or tan in color. It is painless and does not itch. Your pediatrician may recognize it on examination. A referral to a pediatric dermatologist can confirm the diagnosis. No treatment is needed in infancy.

6 months - 5 years

During childhood, the nevus sebaceous remains relatively stable and flat. It does not grow hair, which may become more noticeable as surrounding hair grows in. The patch itself is benign and does not cause any symptoms. Your dermatologist may recommend periodic monitoring. Some families choose early removal for cosmetic reasons, particularly if the patch is on a visible area of the scalp.

5-12 years (pre-puberty)

Before puberty, the nevus sebaceous remains stable. This is a common time for families to discuss elective removal with a dermatologist or plastic surgeon. Removal is a straightforward excision with good cosmetic outcomes. Some dermatologists recommend removal before puberty when the lesion becomes more prominent.

Puberty and beyond

At puberty, hormonal changes cause the nevus sebaceous to thicken, become raised, and develop a more pebbly or warty texture. The risk of secondary tumors developing within the nevus is estimated at 10-30%, but the vast majority of these are benign (most commonly trichoblastoma). The risk of malignant transformation (basal cell carcinoma) is much lower than previously believed — estimated at 1-2%. Most dermatologists recommend either prophylactic excision or close monitoring.

What to Tell Your Pediatrician

  • Describe when you first noticed has a waxy yellowish patch on their scalp (nevus sebaceous) and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if the nevus sebaceous changes in texture, color, or size before puberty.
  • Mention if a new nodule or bump develops within the patch.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

What Should You Do?

When to take action

Probably normal when...
  • Your baby has a flat, yellowish, hairless patch on the scalp that is not growing or changing — this is typical for nevus sebaceous in childhood
  • Your child's nevus sebaceous has been evaluated by a dermatologist and monitoring has been recommended
  • The patch is stable and asymptomatic
Mention at your next visit when...
  • The nevus sebaceous changes in texture, color, or size before puberty
  • A new nodule or bump develops within the patch
  • The patch becomes painful, bleeds, or develops an ulcer
  • You want to discuss the pros and cons of elective removal
Act now when...
  • A rapidly growing nodule develops within the nevus sebaceous — this needs prompt dermatologic evaluation to rule out a secondary tumor
  • The lesion bleeds persistently or develops an ulcer that does not heal

What You Can Do at Home

  • Keep track of when you notice has a waxy yellowish patch on their scalp (nevus sebaceous) — noting the time of day, duration, and any triggers can help your pediatrician.
  • Remember that your baby has a flat, yellowish, hairless patch on the scalp that is not growing or changing — this is typical for nevus sebaceous in childhood — this is generally within the range of normal.
  • At 0-6 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
  • Use fragrance-free, hypoallergenic products on your baby's skin. Avoid over-bathing — 2-3 baths per week is usually sufficient.
  • While monitoring at home, seek immediate care if a rapidly growing nodule develops within the nevus sebaceous — this needs prompt dermatologic evaluation to rule out a secondary tumor.

My Baby Has a Bump Near Their Eye or on Their Head (Dermoid Cyst)

A dermoid cyst is a benign (non-cancerous) growth that is present at birth, though it may not be noticed right away. It forms during fetal development when skin cells become trapped beneath the surface. Dermoid cysts commonly appear near the eyebrow (most common location), on the scalp, or at the bridge of the nose. They typically feel like a firm, non-tender, round lump that does not move much. While they are not dangerous, dermoid cysts do not resolve on their own and are usually removed surgically to prevent complications like infection or growth.

My Baby Has a Streaky or Velvety Raised Birthmark (Epidermal Nevus)

An epidermal nevus is a benign (non-cancerous) overgrowth of skin cells that is present at birth or appears in early childhood. It typically looks like a slightly raised, skin-colored to brownish, velvety or wart-like patch that often follows a linear or streaky pattern along the body's natural skin lines (Blaschko lines). Epidermal nevi are usually isolated and purely cosmetic. However, when they are large or extensive, they can sometimes be associated with abnormalities in other organ systems (epidermal nevus syndrome), so a thorough evaluation is recommended for larger lesions.

My Baby Has a Vascular Malformation (Port-Wine Stain or Deeper)

Vascular malformations are structural abnormalities of blood vessels or lymph vessels that are present at birth (though some become apparent later). Unlike hemangiomas, which grow rapidly and then shrink, vascular malformations grow proportionally with the child and do not go away on their own. They are classified by the type of vessel involved: capillary (port-wine stains), venous, lymphatic, or arteriovenous. Most are benign and manageable, but the approach depends on the type, location, and whether associated conditions are present (such as Sturge-Weber syndrome with facial port-wine stains).

Frequently asked questions

Is has a waxy yellowish patch on their scalp (nevus sebaceous) normal?
A nevus sebaceous (also called nevus sebaceous of Jadassohn) is a benign birthmark that typically appears on the scalp as a flat or slightly raised, yellowish-orange, waxy or velvety patch where hair does not grow. It is present at birth and occurs in about 0.3% of newborns. During childhood, it remains relatively flat and inconspicuous. At puberty, it becomes thicker and more noticeable due to hormonal stimulation. There is a small risk (historically overstated) of developing benign or rarely malignant tumors within the nevus later in life, so monitoring and potential removal are discussed with your dermatologist.
When should I call the doctor about has a waxy yellowish patch on their scalp (nevus sebaceous)?
A rapidly growing nodule develops within the nevus sebaceous — this needs prompt dermatologic evaluation to rule out a secondary tumor The lesion bleeds persistently or develops an ulcer that does not heal
When is has a waxy yellowish patch on their scalp (nevus sebaceous) normal?
Your baby has a flat, yellowish, hairless patch on the scalp that is not growing or changing — this is typical for nevus sebaceous in childhood Your child's nevus sebaceous has been evaluated by a dermatologist and monitoring has been recommended The patch is stable and asymptomatic
What causes has a waxy yellowish patch on their scalp (nevus sebaceous)?
A nevus sebaceous (also called nevus sebaceous of Jadassohn) is a benign birthmark that typically appears on the scalp as a flat or slightly raised, yellowish-orange, waxy or velvety patch where hair does not grow. It is present at birth and occurs in about 0.3% of newborns. During childhood, it remains relatively flat and inconspicuous. At puberty, it becomes thicker and more noticeable due to hormonal stimulation. There is a small risk (historically overstated) of developing benign or rarely malignant tumors within the nevus later in life, so monitoring and potential removal are discussed with your dermatologist. Common explanations include: Your baby has a flat, yellowish, hairless patch on the scalp that is not growing or changing — this is typical for nevus sebaceous in childhood. Your child's nevus sebaceous has been evaluated by a dermatologist and monitoring has been recommended.
What should I mention to my pediatrician about has a waxy yellowish patch on their scalp (nevus sebaceous)?
You should mention has a waxy yellowish patch on their scalp (nevus sebaceous) at your next visit if: The nevus sebaceous changes in texture, color, or size before puberty. A new nodule or bump develops within the patch. The patch becomes painful, bleeds, or develops an ulcer.
Is has a waxy yellowish patch on their scalp (nevus sebaceous) normal at 0-6 months?
In newborns and young infants, a nevus sebaceous typically appears as a flat or slightly raised, smooth, hairless patch on the scalp. It may be yellow, orange, or tan in color. It is painless and does not itch. Your pediatrician may recognize it on examination. A referral to a pediatric dermatologist can confirm the diagnosis. No treatment is needed in infancy.
Is has a waxy yellowish patch on their scalp (nevus sebaceous) normal at 6 months - 5 years?
During childhood, the nevus sebaceous remains relatively stable and flat. It does not grow hair, which may become more noticeable as surrounding hair grows in. The patch itself is benign and does not cause any symptoms. Your dermatologist may recommend periodic monitoring. Some families choose early removal for cosmetic reasons, particularly if the patch is on a visible area of the scalp.
Should I go to the ER for has a waxy yellowish patch on their scalp (nevus sebaceous)?
Seek emergency care if a rapidly growing nodule develops within the nevus sebaceous — this needs prompt dermatologic evaluation to rule out a secondary tumor, or if the lesion bleeds persistently or develops an ulcer that does not heal. When in doubt, call your pediatrician's after-hours line for guidance.
Does has a waxy yellowish patch on their scalp (nevus sebaceous) go away on its own?
In many cases, has a waxy yellowish patch on their scalp (nevus sebaceous) resolves on its own, especially when your baby has a flat, yellowish, hairless patch on the scalp that is not growing or changing — this is typical for nevus sebaceous in childhood. By Puberty and beyond, at puberty, hormonal changes cause the nevus sebaceous to thicken, become raised, and develop a more pebbly or warty texture. The risk of secondary tumors developing within the nevus is estimated at 10-30%, but the vast majority of these are benign (most commonly trichoblastoma). The risk of malignant transformation (basal cell carcinoma) is much lower than previously believed — estimated at 1-2%. Most dermatologists recommend either prophylactic excision or close monitoring.

References

  1. [1]American Academy of Dermatology. Birthmarks: Types and Treatments. AAD
  2. [2]National Library of Medicine. Nevus Sebaceous. StatPearls, 2024. NIH
  3. [3]DermNet NZ. Nevus Sebaceous. DermNet

Doctor Visit Checklist

Bring this checklist to your next pediatrician visit to discuss My Baby Has a Waxy Yellowish Patch on Their Scalp (Nevus Sebaceous).

Things to mention

  • Describe when you first noticed has a waxy yellowish patch on their scalp (nevus sebaceous) and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if the nevus sebaceous changes in texture, color, or size before puberty.
  • Mention if a new nodule or bump develops within the patch.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

Observations to share

  • The nevus sebaceous changes in texture, color, or size before puberty
  • A new nodule or bump develops within the patch
  • The patch becomes painful, bleeds, or develops an ulcer

Urgent signs to report immediately

  • A rapidly growing nodule develops within the nevus sebaceous — this needs prompt dermatologic evaluation to rule out a secondary tumor
  • The lesion bleeds persistently or develops an ulcer that does not heal

My notes

From ismybabyalright.com — free, evidence-based baby health guides

All content follows our editorial policy and is reviewed against published clinical guidelines.

2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members

Bottom line

Most cases of has a waxy yellowish patch on their scalp (nevus sebaceous) are normal. Talk to your pediatrician if a rapidly growing nodule develops within the nevus sebaceous — this needs prompt dermatologic evaluation to rule out a secondary tumor.

Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.

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My Baby Has a Bump Near Their Eye or on Their Head (Dermoid Cyst)

A dermoid cyst is a benign (non-cancerous) growth that is present at birth, though it may not be noticed right away. It forms during fetal development when skin cells become trapped beneath the surface. Dermoid cysts commonly appear near the eyebrow (most common location), on the scalp, or at the bridge of the nose. They typically feel like a firm, non-tender, round lump that does not move much. While they are not dangerous, dermoid cysts do not resolve on their own and are usually removed surgically to prevent complications like infection or growth.

My Baby Has a Streaky or Velvety Raised Birthmark (Epidermal Nevus)

An epidermal nevus is a benign (non-cancerous) overgrowth of skin cells that is present at birth or appears in early childhood. It typically looks like a slightly raised, skin-colored to brownish, velvety or wart-like patch that often follows a linear or streaky pattern along the body's natural skin lines (Blaschko lines). Epidermal nevi are usually isolated and purely cosmetic. However, when they are large or extensive, they can sometimes be associated with abnormalities in other organ systems (epidermal nevus syndrome), so a thorough evaluation is recommended for larger lesions.

My Baby Has a Vascular Malformation (Port-Wine Stain or Deeper)

Vascular malformations are structural abnormalities of blood vessels or lymph vessels that are present at birth (though some become apparent later). Unlike hemangiomas, which grow rapidly and then shrink, vascular malformations grow proportionally with the child and do not go away on their own. They are classified by the type of vessel involved: capillary (port-wine stains), venous, lymphatic, or arteriovenous. Most are benign and manageable, but the approach depends on the type, location, and whether associated conditions are present (such as Sturge-Weber syndrome with facial port-wine stains).

My Baby Has an Extra Nipple (Accessory Nipple)

Accessory (supernumerary) nipples are one of the most common minor congenital findings, occurring in about 1 in 18 people. They appear as small, flat, often pigmented bumps along the "milk line" — an embryonic line running from the armpit to the groin on each side. Most people mistake them for moles. Accessory nipples are almost always harmless and require no treatment. In rare cases, they may be associated with kidney abnormalities, so some pediatricians recommend a renal ultrasound if one is found, though this practice varies.

My Baby Was Born with a Raw Spot on Their Scalp (Aplasia Cutis)

Aplasia cutis congenita (ACC) is a condition where a baby is born with a small area of missing skin, most commonly on the scalp. It occurs in about 1 in 10,000 births. The affected area may look like a raw wound, an ulcer, or may have already healed into a thin, shiny scar by the time of birth. Most cases are small, isolated, and heal well with basic wound care — the area eventually forms a hairless scar. Larger defects or those associated with other findings may need more investigation, but isolated small ACC has an excellent prognosis.

New Treatments for Atopic Dermatitis (Eczema) in Children

Treatment for atopic dermatitis in children has advanced significantly in recent years. While moisturizers and topical steroids remain first-line treatments, newer options include non-steroidal topical medications (like crisaborole), biologic therapies (like dupilumab, approved for children 6 months and older), and JAK inhibitors. Most children's eczema is well-managed with basic skin care and mild topical treatments, but these newer options provide hope for moderate-to-severe cases.