What causes rash and constipation in a 3-month-old?

Question

Hello doctor,

My 3-month-old has developed a rash that began on her neck and has now spread across much of her torso. It does not appear to be itchy or cause her distress, but it looks quite red, inflamed, and has multiple raised bumps. Additionally, since yesterday, she has been experiencing constipation and seems uncomfortable.

Please help.

Thank you.

Answer 1

Hi,

Welcome to icliniq.com.

I understand your concern.

A rash that starts in the neck folds and spreads throughout the chest in a 3-month-old child, looking red with small raised bumps but not producing itch or pain, is most likely heat rash (miliaria) or irritant/contact dermatitis. It can worsen from perspiration, milk, saliva, or friction, and the neck is usually the first place to show signs because moisture gets trapped in the folds. Thick creams may make heat rash worse by blocking perspiration ducts, which could explain why it spreads.

Suggestions for care:

Once a day, wash your skin with only lukewarm water. Do not wash too often.
Dry the skin fully and keep your infant cool.
Wear loose cotton clothes.
For now, stop using thick ointments. If you need to, you can use a light, fragrance-free moisturizer or a zinc-based barrier lotion on skin folds.

Constipation is prevalent at this age. As long as her feces are soft, she is urinating normally, and she is eating properly, this is usually only transient and not related to the rash. A gentle stomach massage, biking the legs, and making sure they get enough food can all help. Don't use laxatives or suppositories unless your doctor tells you to.

If you need to be evaluated in person,

The rash gets crusty, oozy, or gets worse quickly.
There is a fever, trouble eating, or pain.
The rash does not get better in three to five days.
This kind of rash is usually not serious and gets better with good skin care and keeping the baby cool and dry.

I hope this helps.

Thank you.