![]() Porphyria causes red-pink fluorescence of the skin ( porphyria cutanea tarda), or teeth ( erythropoetic porphyria).Acne fluoresces orange-red due to cutibacteria in hair follicles.Pseudomonas in spa pool folliculitis and wound infection fluoresces green.Erythrasma-corynebacteria bacteria cause a pigmented rash in skin folds that fluoresces a coral-pink colour.Fungal infection due to other organisms does not fluoresce Microsporum species fluoresce blue-green ( M canis, M audouinii, M ferrugineum, M distortum) Trichophyton schoenleinii fluoresces dull blue. Tinea capitis-areas of scale and baldness due to fungal infection.Malassezia folliculitis-hair follicles fluoresce bluish-white.When active, the scale emits a yellowish or orange glow Pityriasis versicolor-a slightly scaly persistent rash on anterior chest and back caused by Malassezia yeasts.In contrast, areas of reduced blood flow are unchanged Hypopigmented skin has sharper borders under black light and fluoresces bright blue-white (or sometimes, yellowish green) due to accumulated biopterins. Loss of pigmentation (eg, vitiligo) or reduced pigmentation (eg, ash-leaf macules in tuberous sclerosis and hypomelanosis of Ito) to identify affected areas in light-skinned people.Pigmented lesions have a clear border under Wood light because the light is absorbed by increased melanin ![]()
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