They have a type of prickly heat that doesn't occur just in humid summertime but any time they sweat. It can happen from exercise, from too many warm bedclothes or rapid changes in temperature from cold to warm. If some lesions look different, ask your doctor. If they turn out to be infected, they can be treated with antibiotics. Recognize and treat pustules or crusted lesions.
Allergens are materials such as pollen, pet dander, foods, or dust, that cause allergic responses.
Allergic diseases such as asthma and hay fever, which flare quickly, are easy to tie to allergens. Itching and hives appear soon after exposure to these airborne allergens and last only briefly. The slower, continuing, chronic eczema of AD may be more difficult to tie to specific allergens. In general, food allergies trigger AD only in children, mainly those with severe disease. Pollens, dust mites and pets can seldom be shown to trigger eczema.