Late pigmentation - Altmeyers Encyclopedia

Synonym(s)

Delayed pigmentation; Indirect pigmentation; Sun tan

Definition
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Pigmentation (brown coloration) of the skin, which occurs 24-72 hours after exposure to sunlight or UVB radiation (see below UV rays) Skin tanning by melanogenesis persists for weeks to months. See also skin types. S.a. Instant pigmentation.

Etiopathogenesis
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Irradiation with UV radiation from the UVB spectrum. This results in increased formation of melanosome complexes and penetration of the melanocyte cell extensions into the cytoplasm of adjacent keratinocytes with periodic release of melanosome complexes.

Note(s)
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The number of melanocytes shows topographic and ethnic differences. Thus, skin pigmentation depends on the number and activity of epidermal melanocytes. In an epidermal basal cell there are about 400 melanocytes in a person with skin type V-VI, whereas only about 100 melanocytes are found in a fair-skinned Central European. The facultative pigmentation of the skin (sun tanning) depends on the ability of the skin to additionally pigment after UV irradiation beyond the constitutional skin type.