Raised Bumps on Baby's Skin
The short answer
Raised bumps on a baby's skin have many possible causes, most of which are harmless. Common causes include keratosis pilaris (tiny rough bumps on upper arms and thighs), molluscum contagiosum (small, dome-shaped, pearl-like bumps from a viral infection), insect bites, viral rashes, and milia (tiny white bumps in newborns). The bumps' appearance - their color, size, texture, location, and whether they are itchy - helps determine the cause. Most resolve on their own or with simple treatment.
By Age
What to expect by age
Newborns commonly develop milia (tiny white bumps on the face), baby acne (red bumps and pustules on cheeks and forehead at 2-4 weeks), and erythema toxicum (blotchy red patches with small yellow bumps in the first few days). These are all harmless and resolve without treatment. Miliaria (heat rash) causes tiny red bumps from blocked sweat ducts. If bumps are widespread with fever, consult your pediatrician to evaluate for a viral illness or infection.
Common causes of raised bumps in toddlers include keratosis pilaris (rough, sandpaper-like bumps on upper arms, thighs, and cheeks - harmless and very common), molluscum contagiosum (smooth, dome-shaped, flesh-colored bumps with a central dimple - a common viral infection that spreads in daycare), insect bites (grouped red itchy bumps), and warts (rough, raised bumps from HPV). Most of these are harmless and resolve over time, though molluscum may take 6-18 months to clear.
What Should You Do?
When to take action
- Tiny white bumps on a newborn's face (milia)
- Rough, sandpaper-like bumps on the upper arms and thighs (keratosis pilaris)
- Small red bumps during hot weather (heat rash)
- A few smooth, dome-shaped bumps that have been present for weeks (molluscum)
- Bumps are spreading or multiplying
- Bumps are itchy and bothersome to your child
- You want a diagnosis to know what the bumps are
- Bumps are on the face and you are concerned about scarring
- Bumps are accompanied by fever and your child appears unwell
- Bumps are rapidly spreading with pain and redness (possible infection)
- A bump is growing rapidly, changing shape, or has an irregular appearance
- Raised purple or dark red bumps that do not blanch (turn white) when pressed (petechiae/purpura - seek immediate care)
Sources
Related Resources
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 Heat Rash (Prickly Heat / Miliaria)
Heat rash happens when sweat gets trapped under your baby's skin, causing tiny red bumps or blisters, usually in skin folds or areas covered by clothing. It is harmless and clears up quickly once your baby is cooled down. Dressing your baby in one layer more than you would wear is a good rule of thumb to prevent overheating.
My Baby Has Insect Bites
Insect bites on babies are very common and usually result in small red bumps that may be itchy or slightly swollen. Because babies have sensitive skin and immature immune systems, their reactions to bug bites can look more dramatic than an adult's. Most bites heal on their own within a few days with simple home care.
Baby Acne (Neonatal Acne)
Baby acne is a very common, harmless condition that appears as small red or white bumps on your newborn's face, usually around 2-4 weeks of age. It is caused by maternal hormones still circulating in your baby's system and clears up on its own within a few weeks to months without any treatment.
Baby Blister on Lip from Nursing
A nursing blister (also called a suck callus) is a small, painless blister or thickened patch on your baby's upper lip caused by the friction of latching during breastfeeding or bottle feeding. It is completely harmless, does not hurt your baby, and does not need any treatment. These are very common in newborns and typically come and go in the early weeks.
Blisters on Baby's Skin - Causes and When to Worry
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.