Blisters on Baby's Skin - Causes and When to Worry
Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician
Content reviewed against published AAP, AAP, NIH guidelines
Last reviewed:
Baby skin is sensitive and changes frequently. If you are noticing blisters on baby's skin - causes and when to worry, here is what you need to know.
The short answer
Blisters on a baby's skin can have many causes ranging from harmless (sucking blisters, friction blisters) to conditions requiring medical attention (burns, infections like hand-foot-and-mouth disease, impetigo, or herpes). A single blister on a newborn's lip or hand from sucking is very common and harmless. Multiple blisters, blisters with fever, blisters that spread rapidly, or blisters in a newborn under 1 month should be evaluated by a doctor.
Key takeaways
- Blisters on a baby's skin can have many causes ranging from harmless (sucking blisters, friction blisters) to conditions requiring medical attention (burns, infections like hand-foot-and-mouth disease, impetigo, or herpes). A single blister on a newborn's lip or hand from sucking is very common and harmless. Multiple blisters, blisters with fever, blisters that spread rapidly, or blisters in a newborn under 1 month should be evaluated by a doctor.
- Usually normal when: A single blister on your newborn's lip or hand from sucking that is clear and painless
- Call your doctor if: Any blisters in a newborn under 1 month, especially with fever, lethargy, or poor feeding - neonatal herpes is a medical emergency
- 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.”
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What Parents Should Know
According to AAP, NIH guidelines, blisters on a baby's skin can have many causes ranging from harmless (sucking blisters, friction blisters) to conditions requiring medical attention (burns, infections like hand-foot-and-mouth disease, impetigo, or herpes). A single blister on a newborn's lip or hand from sucking is very common and harmless. Multiple blisters, blisters with fever, blisters that spread rapidly, or blisters in a newborn under 1 month should be evaluated by a doctor. At 0-3 months, sucking blisters are extremely common in newborns - they appear on the lips, hands, or wrists from vigorous sucking (sometimes even in the womb). These are painless, clear, and resolve on their own. Do not pop them. Newborn acne and erythema toxicum can also cause small fluid-filled bumps. However, blisters in a newborn under 1 month that are widespread, appear infected (cloudy fluid, red base), or are accompanied by fever need urgent evaluation, as neonatal herpes is a medical emergency. It is generally considered normal when a single blister on your newborn's lip or hand from sucking that is clear and painless. However, you should contact your pediatrician promptly if any blisters in a newborn under 1 month, especially with fever, lethargy, or poor feeding - neonatal herpes is a medical emergency.
Normal vs. Concerning
By Age
What to expect by age
0-3 months
Sucking blisters are extremely common in newborns - they appear on the lips, hands, or wrists from vigorous sucking (sometimes even in the womb). These are painless, clear, and resolve on their own. Do not pop them. Newborn acne and erythema toxicum can also cause small fluid-filled bumps. However, blisters in a newborn under 1 month that are widespread, appear infected (cloudy fluid, red base), or are accompanied by fever need urgent evaluation, as neonatal herpes is a medical emergency.
3-12 months
Friction blisters from new shoes, rough surfaces, or crawling are common as babies become more mobile. Drool rash can cause small blisters around the mouth and chin. Hand-foot-and-mouth disease (coxsackievirus) causes painful blisters on hands, feet, and in the mouth alongside fever - this is very common in babies who are in daycare. Burns from hot liquids, surfaces, or sunburn can also cause blisters and need appropriate first aid and potentially medical evaluation.
12-24 months
Toddlers encounter more causes of blisters: hand-foot-and-mouth disease (extremely common in daycare settings), impetigo (honey-colored crusted blisters from bacterial infection), insect bite reactions (some children develop blisters at bite sites), allergic contact dermatitis (from plants, products), and friction blisters from increased activity. Most heal on their own, but impetigo requires antibiotic treatment and hand-foot-and-mouth requires comfort care.
2-3 years
At this age, blisters are most commonly from hand-foot-and-mouth disease, chicken pox (if unvaccinated), friction, burns, or insect bites. Chicken pox blisters are itchy, start on the trunk, and progress through stages (red bumps, blisters, crusts). If your child is vaccinated, breakthrough chicken pox is usually very mild. Allergic reactions to plants like poison ivy cause linear blisters where the plant touched the skin. Do not pop blisters - they protect the healing skin beneath.
What to Tell Your Pediatrician
- Describe when you first noticed blisters on baby's skin - causes and when to worry and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if multiple blisters appearing over a few days without a clear cause.
- Mention if blisters that are cloudy, yellow, or have honey-colored crusts - suggesting bacterial infection.
- 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
- A single blister on your newborn's lip or hand from sucking that is clear and painless
- A small friction blister from new shoes or crawling that is not spreading
- A few blisters on hands, feet, and mouth with mild fever in a child over 6 months - likely hand-foot-and-mouth disease
- A blister at the site of an insect bite that is not spreading or showing signs of infection
- Multiple blisters appearing over a few days without a clear cause
- Blisters that are cloudy, yellow, or have honey-colored crusts - suggesting bacterial infection
- Blisters in the mouth that are preventing your child from eating or drinking
- A blister that is not healing after a week or seems to be getting worse
- Any blisters in a newborn under 1 month, especially with fever, lethargy, or poor feeding - neonatal herpes is a medical emergency
- Blisters from a burn - run cool (not cold) water for 20 minutes and seek medical evaluation for any burn larger than a coin
- Rapidly spreading blisters with high fever, your child looks very unwell, or blisters are filled with blood
- Blisters around the eyes or in the genital area
What You Can Do at Home
- Keep track of when you notice blisters on baby's skin - causes and when to worry — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that a single blister on your newborn's lip or hand from sucking that is clear and painless — 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 any blisters in a newborn under 1 month, especially with fever, lethargy, or poor feeding - neonatal herpes is a medical emergency.
Related Conditions
Baby Rash That Won't Go Away
A rash that persists for more than 2 weeks or keeps recurring likely needs evaluation beyond "wait and see." The most common causes of persistent rashes in babies include eczema (dry, itchy, patches), fungal infections (especially in skin folds), contact dermatitis (reaction to a product), and less commonly, psoriasis or autoimmune conditions. Proper identification is important because the treatment differs significantly - using the wrong cream (like steroid cream on a fungal infection) can actually make things worse.
Baby Rash Around the Mouth - Drool Rash and Other Causes
A rash around your baby's mouth is most commonly drool rash (contact irritant dermatitis from constant moisture). Drool rash looks like red, slightly rough, chapped skin around the mouth, chin, and cheeks. It is very common during teething when drool production increases dramatically. Other causes include food contact irritation (especially from acidic foods like tomato and citrus), pacifier friction, eczema, and occasionally hand-foot-and-mouth disease. True food allergies typically cause hives or swelling, not a flat red rash.
Baby Rash in Skin Folds - Neck, Armpits, and Creases
Rashes in baby's skin folds (neck, armpits, groin, behind ears, elbow and knee creases) are extremely common because these warm, moist areas trap moisture from drool, spit-up, sweat, and milk. The medical term is intertrigo. Most fold rashes respond to keeping the area clean and dry. If the rash is bright red, has satellite spots, or has a yeasty smell, it may have developed a yeast (candida) infection and need antifungal treatment. Keeping folds dry is both the treatment and prevention.
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 blisters on baby's skin - causes and when to worry normal?
When should I call the doctor about blisters on baby's skin - causes and when to worry?
When is blisters on baby's skin - causes and when to worry normal?
What causes blisters on baby's skin - causes and when to worry?
What should I mention to my pediatrician about blisters on baby's skin - causes and when to worry?
Is blisters on baby's skin - causes and when to worry normal at 0-3 months?
Is blisters on baby's skin - causes and when to worry normal at 3-12 months?
Should I go to the ER for blisters on baby's skin - causes and when to worry?
Does blisters on baby's skin - causes and when to worry go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Blisters on Baby's Skin - Causes and When to Worry.
Things to mention
- Describe when you first noticed blisters on baby's skin - causes and when to worry and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if multiple blisters appearing over a few days without a clear cause.
- Mention if blisters that are cloudy, yellow, or have honey-colored crusts - suggesting bacterial infection.
- 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
- Multiple blisters appearing over a few days without a clear cause
- Blisters that are cloudy, yellow, or have honey-colored crusts - suggesting bacterial infection
- Blisters in the mouth that are preventing your child from eating or drinking
Urgent signs to report immediately
- Any blisters in a newborn under 1 month, especially with fever, lethargy, or poor feeding - neonatal herpes is a medical emergency
- Blisters from a burn - run cool (not cold) water for 20 minutes and seek medical evaluation for any burn larger than a coin
- Rapidly spreading blisters with high fever, your child looks very unwell, or blisters are filled with blood
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 blisters on baby's skin - causes and when to worry are normal. Talk to your pediatrician if any blisters in a newborn under 1 month, especially with fever, lethargy, or poor feeding - neonatal herpes is a medical emergency.
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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Related Skin Concerns
Baby Rash That Won't Go Away
A rash that persists for more than 2 weeks or keeps recurring likely needs evaluation beyond "wait and see." The most common causes of persistent rashes in babies include eczema (dry, itchy, patches), fungal infections (especially in skin folds), contact dermatitis (reaction to a product), and less commonly, psoriasis or autoimmune conditions. Proper identification is important because the treatment differs significantly - using the wrong cream (like steroid cream on a fungal infection) can actually make things worse.
Baby Rash Around the Mouth - Drool Rash and Other Causes
A rash around your baby's mouth is most commonly drool rash (contact irritant dermatitis from constant moisture). Drool rash looks like red, slightly rough, chapped skin around the mouth, chin, and cheeks. It is very common during teething when drool production increases dramatically. Other causes include food contact irritation (especially from acidic foods like tomato and citrus), pacifier friction, eczema, and occasionally hand-foot-and-mouth disease. True food allergies typically cause hives or swelling, not a flat red rash.
Baby Rash in Skin Folds - Neck, Armpits, and Creases
Rashes in baby's skin folds (neck, armpits, groin, behind ears, elbow and knee creases) are extremely common because these warm, moist areas trap moisture from drool, spit-up, sweat, and milk. The medical term is intertrigo. Most fold rashes respond to keeping the area clean and dry. If the rash is bright red, has satellite spots, or has a yeasty smell, it may have developed a yeast (candida) infection and need antifungal treatment. Keeping folds dry is both the treatment and prevention.
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.