heat rash hives allergy reaction knee close-up reference picture of blotchy mottled red skin erythema ab igne also known as eai

allergic allergy atopic atrophy background beauty blotch blotchy body bottle caucasian close condition dermatology eai erythema exposure health healthcare heat hives hot igne inflammatory knee leg limb livedo macules marble marbled medical mottle mottled nettle pain patch picture problem rash reaction red reference reticularis severe skin suffering symptoms telangiectasia temperature thigh urticaria water