Urticaria rash (hives) on ankle due to nettles

Urticaria rash (hives) on ankle due to nettles

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Credit: DR P. MARAZZI/SCIENCE PHOTO LIBRARY

Caption: Nettle rash. Numerous small pink urticaria weals on the ankle of an 8-year-old boy. Urticaria, also known as nettle rash or hives, is an allergic skin condition in which a rash of itchy weals develops on the skin. In this case the reaction was triggered by stings from the nettle plant, Urtica dioica. Nettles have stinging hairs, the tips of which break off when the plant is brushed against the skin. The sting injects a mixture of acetylcholine and histamine, causing the swellings seen here. Urticaria can be due to a variety of other factors but often the cause is not known. Calamine lotion can soothe the itching and antihistamine drugs may be given.

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Keywords: allergy, ankle, condition, disease, disorder, healthcare, hives, medical, medicine, nettle, nettle rash, nettles, rash, skin, skin rash, urtica dioica, urticaria, urticaria on skin

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