It is a recurrent, acute viral infection which affects the skin and/or mucosa of adolescents and adults and is produced by the herpes simplex virus.  Before its appearance the patients sense a burning sensation and reddening of the area where numerous cluster-shaped vesicles later appear which burst spontaneously forming scabs which bleed when one tries to remove them. After 15 days the lesions heal without scarring.  Recurrences are not predictable, but stress, sunburn and immunodepression trigger their appearance.

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