If your child has a rash under their armpit, there are several possible causes, including irritation, chafing, eczema, ringworm, and contact dermatitis. To determine the cause of the rash, its important to identify any potential irritants or allergens that your child may have come into contact with, such as new laundry detergent, fabric softener, or personal care products.
To treat the rash, you can try applying over-the-counter (OTC) hydrocortisone creams (0.5-1.0 percent) several times a day for a few days. If the rash is caused by a fungal infection, you may need to use prescription-grade antifungal creams or nonsteroidal creams during flare-ups. For eczema, you can use a thick, plain moisturizer with no fragrance as often as necessary on your child, even when the skin is clear of eczema.
To prevent underarm rashes, you can try identifying and avoiding potential allergens where possible, using unscented and fragrance-free personal care products, and bathing regularly in lukewarm water but not for extended periods. You can also try wearing loose, cotton clothing that allows your armpit to breathe, staying in a cool environment, and using antichafing powders.
Its important to seek medical advice if you cant identify the cause of the rash or if it worsens or persists. If the rash is severe and/or isnt going away, or if you notice signs of infection (such as fever, redness, swelling beyond the rash), you should also talk to your pediatrician.
