My Baby Has a Bump (Sebaceous Cyst)
Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician
Content reviewed against published AAP, Mayo Clinic, AAD guidelines
Last reviewed:
Baby skin is sensitive and changes frequently. If you are noticing has a bump (sebaceous cyst), here is what you need to know.
The short answer
A small, smooth, movable bump under your baby's skin is most likely a benign sebaceous or epidermal inclusion cyst. These are harmless collections of skin cells or oil beneath the surface and are quite common in babies and toddlers. They almost never require treatment unless they become infected or grow rapidly.
Key takeaways
- A small, smooth, movable bump under your baby's skin is most likely a benign sebaceous or epidermal inclusion cyst. These are harmless collections of skin cells or oil beneath the surface and are quite common in babies and toddlers. They almost never require treatment unless they become infected or grow rapidly.
- Usually normal when: A small, smooth, painless bump under the skin that moves slightly when touched
- Call your doctor if: The bump becomes red, warm, swollen, or painful, or begins draining pus, which could indicate infection
- 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.”
Parents everywhere have the same worry. You are doing the right thing by looking into it.
What Parents Should Know
According to AAP, Mayo Clinic, AAD guidelines, a small, smooth, movable bump under your baby's skin is most likely a benign sebaceous or epidermal inclusion cyst. These are harmless collections of skin cells or oil beneath the surface and are quite common in babies and toddlers. They almost never require treatment unless they become infected or grow rapidly. At 0-3 months, small bumps on a newborn's skin are extremely common and are usually milia (tiny white bumps caused by trapped keratin) rather than true sebaceous cysts. Milia appear on the nose, cheeks, and forehead and resolve on their own within a few weeks. True cysts in this age group are rare but can occur anywhere on the body. They feel like smooth, round, pea-sized lumps that move slightly under the skin when touched. It is generally considered normal when a small, smooth, painless bump under the skin that moves slightly when touched. However, you should contact your pediatrician promptly if the bump becomes red, warm, swollen, or painful, or begins draining pus, which could indicate infection.
Normal vs. Concerning
By Age
What to expect by age
0-3 months
Small bumps on a newborn's skin are extremely common and are usually milia (tiny white bumps caused by trapped keratin) rather than true sebaceous cysts. Milia appear on the nose, cheeks, and forehead and resolve on their own within a few weeks. True cysts in this age group are rare but can occur anywhere on the body. They feel like smooth, round, pea-sized lumps that move slightly under the skin when touched.
3-12 months
If a firm, painless bump appears under your baby's skin and does not go away after a few weeks, it may be a dermoid cyst or epidermal inclusion cyst. These are benign growths that form when skin cells become trapped during development. They are most commonly found on the scalp, face, or neck. They do not cause pain and usually grow very slowly or not at all. Your pediatrician can typically diagnose them with a simple physical exam.
1-2 years
Toddlers may develop small cysts from minor skin trauma, clogged pores, or simply as a normal variation. A bump that has been present and unchanged for months is very unlikely to be anything concerning. If the cyst is in an area where clothing or diapers rub against it frequently, it may occasionally become irritated or red, but this usually resolves with keeping the area clean and dry.
2-3 years
At this age, children are more prone to bumps from falls and minor injuries, which can sometimes be confused with cysts. A true cyst will feel smooth and round under the skin, be painless, and persist unchanged over weeks. If your child's cyst has been stable and is not bothering them, continued monitoring is all that is typically needed. Your doctor may recommend removal only if it becomes repeatedly infected or is in a cosmetically sensitive area.
What to Tell Your Pediatrician
- Describe when you first noticed has a bump (sebaceous cyst) and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if the bump is growing noticeably over a period of weeks.
- Mention if the cyst is located near the eye, on the midline of the scalp, or in an unusual location, as some cysts in these areas warrant further evaluation.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- A small, smooth, painless bump under the skin that moves slightly when touched
- A bump that has been present for weeks or months without changing size significantly
- Tiny white bumps on a newborn's nose or cheeks, which are likely milia and will resolve on their own
- A bump that does not bother your baby and shows no signs of redness, warmth, or tenderness
- The bump is growing noticeably over a period of weeks
- The cyst is located near the eye, on the midline of the scalp, or in an unusual location, as some cysts in these areas warrant further evaluation
- Your baby has multiple bumps appearing in a short time frame
- The bump becomes red, warm, swollen, or painful, or begins draining pus, which could indicate infection
- A bump on the midline of the head or spine that seems attached to deeper tissue, as this may need imaging to rule out a connection to underlying structures
What You Can Do at Home
- Keep track of when you notice has a bump (sebaceous cyst) — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that a small, smooth, painless bump under the skin that moves slightly when touched — this is generally within the range of normal.
- At 0-3 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 the bump becomes red, warm, swollen, or painful, or begins draining pus, which could indicate infection.
Related Resources
Baby Skin Conditions Guide
Visual guide to common baby skin conditions, rashes, and when to see a doctor.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
When to Call the Doctor
General guide on when to call the pediatrician, visit urgent care, or go to the ER.
Frequently asked questions
Is has a bump (sebaceous cyst) normal?
When should I call the doctor about has a bump (sebaceous cyst)?
When is has a bump (sebaceous cyst) normal?
What causes has a bump (sebaceous cyst)?
What should I mention to my pediatrician about has a bump (sebaceous cyst)?
Is has a bump (sebaceous cyst) normal at 0-3 months?
Is has a bump (sebaceous cyst) normal at 3-12 months?
Should I go to the ER for has a bump (sebaceous cyst)?
Does has a bump (sebaceous cyst) go away on its own?
References
- [1]American Academy of Pediatrics. Baby Birthmarks & Rashes. HealthyChildren.org. AAP
- [2]Mayo Clinic. Epidermoid Cysts (Sebaceous Cysts). Diagnosis & Treatment. Mayo Clinic
- [3]American Academy of Dermatology. Cysts: Overview. AAD
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss My Baby Has a Bump (Sebaceous Cyst).
Things to mention
- Describe when you first noticed has a bump (sebaceous cyst) and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if the bump is growing noticeably over a period of weeks.
- Mention if the cyst is located near the eye, on the midline of the scalp, or in an unusual location, as some cysts in these areas warrant further evaluation.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- The bump is growing noticeably over a period of weeks
- The cyst is located near the eye, on the midline of the scalp, or in an unusual location, as some cysts in these areas warrant further evaluation
- Your baby has multiple bumps appearing in a short time frame
Urgent signs to report immediately
- The bump becomes red, warm, swollen, or painful, or begins draining pus, which could indicate infection
- A bump on the midline of the head or spine that seems attached to deeper tissue, as this may need imaging to rule out a connection to underlying structures
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
Related Resources
Bottom line
Most cases of has a bump (sebaceous cyst) are normal. Talk to your pediatrician if the bump becomes red, warm, swollen, or painful, or begins draining pus, which could indicate infection.
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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