Causes
A skin allergy is a skin condition where the immune systems reacts strongly to an allergen. The reaction can cause irritation, rashes, swelling, or hives. The cause of the allergy depends on the condition and the allergen.
A skin allergy is when skin becomes irritated because the immune system reacted to something that is usually harmless. This is called an allergic reaction. The most common allergic skin conditions are atopic dermatitis (eczema), allergic contact dermatitis (rash where allergen touched the skin), urticaria (hives), and angioedema (swelling). Hives and swelling often happen together, and may suggest a serious and life-threatening allergic reaction.
