<unk><unk>  is a form of contact dermatitis, beginning with pruritus, erythema, and pigmentation that gradually spreads which, after reaching a certain extent, becomes stationary.  The pathogenesis of<unk><unk>  is believed to be sun exposure following the use of some perfumes or creams (a photocontact dermatitis).
Riehl's melanosis
Becker's nevus
Prosector's wart
Erythromelanosis follicularis faciei et colli
Bowen's disease
Bowen’s disease
Blue nevus
Terry's nails