Baby Blistering Rash (Fluid-Filled Blisters)
The short answer
Fluid-filled blisters on a baby's skin can be caused by many things, including hand-foot-and-mouth disease, friction burns, insect bites, impetigo, chickenpox, or herpes simplex. While many causes are mild, blistering rashes in young babies or those accompanied by fever should be evaluated by a doctor to determine the cause and best treatment.
Parents everywhere have the same worry. You are doing the right thing by looking into it.
By Age
What to expect by age
Blistering rashes in very young infants should always be evaluated promptly. While sucking blisters on the lips and hands from vigorous feeding are common and harmless, other causes such as neonatal herpes simplex can be serious and require urgent treatment. Any clustered blisters on a newborn, especially with fever, need immediate medical attention.
At this age, blistering rashes may include impetigo, viral infections, or friction blisters from crawling attempts. Hand-foot-and-mouth disease can occur at this age with small blisters on the palms, soles, and in the mouth. Burns and scalds can also cause blisters and should be treated promptly.
Hand-foot-and-mouth disease is one of the most common causes of blistering rashes at this age, particularly in daycare settings. Insect bites may blister in sensitive babies. Impetigo can cause honey-colored crusted blisters. Most blistering rashes at this age are manageable but should be identified correctly.
Toddlers may develop blistering rashes from chickenpox (even if vaccinated, breakthrough cases can occur with mild symptoms), hand-foot-and-mouth disease, impetigo, or contact with irritants. Burns from hot surfaces are also common in this curious age group. If blisters are widespread or your child has a fever, see your pediatrician.
What Should You Do?
When to take action
- A small sucking blister on a newborn's lip from breastfeeding
- A single friction blister on the foot from new shoes
- Small blisters on palms and soles during a mild hand-foot-and-mouth infection with a child who is eating and drinking
- Multiple blisters appear without a clear cause
- Blisters are accompanied by mild fever and your baby is uncomfortable but not seriously ill
- Blisters that are crusting with a honey-colored coating, suggesting impetigo
- A newborn under 6 weeks develops clustered blisters, especially near the eyes, mouth, or genitals, as this could indicate neonatal herpes and requires emergency treatment
- Widespread blistering with fever, lethargy, or poor feeding in any age group
- Large blisters that cover a significant area or blisters with red, warm, spreading skin around them suggesting a serious skin infection
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
Worrying about your baby means you care. That is a good thing.
Related Skin Concerns
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.
Hand, Foot, and Mouth Disease in Babies
Hand, foot, and mouth disease (HFMD) is a very common viral illness in babies and toddlers, especially during summer and fall. It causes small blisters or sores in the mouth and a spotted rash on the hands and feet. While it can make your child uncomfortable for a few days, it is not dangerous and resolves on its own within 7-10 days.
My Baby Has Impetigo
Impetigo is a common bacterial skin infection in babies and young children, caused by staph or strep bacteria. It appears as red sores that quickly develop into honey-colored crusts, most often around the nose, mouth, and hands. While it looks unpleasant, impetigo is very treatable with antibiotic ointment or oral antibiotics and clears up within a week or two of starting treatment.
Cold Sores (Herpes Simplex) on Baby
Cold sores are caused by herpes simplex virus (HSV) and can be very dangerous for newborns under 3 months old. In older babies and toddlers, a first cold sore infection may cause painful mouth sores and fever but is usually manageable. Never kiss a baby when you have an active cold sore, and seek immediate medical attention if a newborn is exposed.
Baby Acne vs Eczema: How to Tell the Difference
Baby acne and eczema can both cause facial rashes, but they look and feel different. Baby acne appears as small red or white bumps, similar to teenage acne, usually on the cheeks, nose, and forehead. Eczema causes dry, rough, red, itchy patches. Baby acne resolves on its own by 3 to 4 months, while eczema may need ongoing management.
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.