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A 60-year-old woman complains of a persistent itch on the vulva.
A persistent itch or pruritus is an unpleasant sensation that provokes a desire to scratch. A number of substances are known to induce itch via stimulation of nociceptive neurons superficially located in the epidermis and subepidermal tissues. These include inflammatory mediators such as histamine, neuropeptide substance P, serotonin, bradykinin, tryptase from mast cells, and endothelin.