Pityriasis

PYTHIRIASIS is a skin disease manifested by inflammatory changes in the skin with the formation of scales on it.

Etiology and pathogenesis Skin infection. Both thin horny plates and layers of granular cells are affected. Pityriasis versicolor develops when representatives of opportunistic flora (fungi such as Malassezia spp., yeasts, diphtheroids, as well as gram-positive cocci, spirochetes and bacilli) become active on the skin. As a rule, the disease begins with the appearance of small pink spots of a round shape with a thickened, rough surface, in the center of which a grayish-white scaly crust of tiny scales is formed, and a large rim of erythema appears around them. There is an opinion about the hereditary nature of the disease. Increased sensitivity to light, especially ultraviolet rays, apparently causes a disruption in the formation of the melanin pigment in the superficial layers of the skin, which serves as a provoking factor in the development of the disease. For atopic dermatitis skin