Nettle rash

Nettle rash

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Credit: DR P. MARAZZI/SCIENCE PHOTO LIBRARY

Caption: MODEL RELEASED. Nettle rash. 2-day-old urticaria on a 66-year-old man's arm. Urticaria 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 also be caused by several 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: arm, condition, dermatological, dermatology, disease, disorder, healthcare, inflamed, inflammation, itchy, male, man, medical, medicine, nettle rash, painful, patient, plant, skin, sore, sting, urtica dioca, urticaria

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