The appearance can range from an almost incidental swelling of tissue to an outbreak of painful eruptive sores. Rashes can sometimes be tough to distinguish—even for a trained eye. Some rashes quickly resolve on their own, but others can be cause for concern. If you're worried about a rash, seek the advice of a dermatologist. There are times when an allergy or infection will cause the immune system to release a substance called histamine into the bloodstream.
Skip to content. Childhood rashes are common. Most rashes are harmless and disappear without the need for treatment. See your GP or call GP out of hours service if your child has a rash and seems unwell, or if you're worried. This guide may give you a better idea of the cause of the rash. But don't rely on it to diagnose your baby's condition if they show any signs of being unwell.
Skin rashes can occur from a variety of factors, including infections, heat, allergens, immune system disorders and medications. One of the most common skin disorders that causes a rash is atopic dermatitis ay-TOP-ik dur-muh-TI-tis , also known as eczema. Atopic dermatitis is an ongoing chronic condition that makes skin red and itchy. Most often it appears as patches on the hands, feet, ankles, neck, upper body and limbs.