Synonym(s)
DefinitionThis section has been translated automatically.
Ash-grey to brownish pigmentation immediately after irradiation in the UV range between 340 and 450nm (see UV rays below), which differs in colour from the more copper-brown UVB-induced (late pigmentation). This phenomenon is also called the Meirowsky phenomenon after the first describer. The maximum effective wavelength for immediate pigmentation is 340nm. The pigmentation disappears already minutes to hours after irradiation.
EtiopathogenesisThis section has been translated automatically.
Irradiation in the UVA range. Displacement of the melanosome complexes into the periphery of the melanocytes or keratinocytes. Photooxidation of unstained melanin precursors.
The threshold doses are between 30 and 60 J/cm2 for skin types I and II and between 15 and 25 J/cm2 for skin types II and IV (inverse correlation to skin type; see also MED).
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Incoming links (7)
Direct pigmentation; Immediate pigment darkening; Ipd; Light tolerance; Meirovsky phenomenon; Pigmentation; Uv rays;Disclaimer
Please ask your physician for a reliable diagnosis. This website is only meant as a reference.
Prof. Dr. med. Peter Altmeyer