Common Fungal Diseases of Skin
The test likely to help in diagnosis of a patient who presents with an itchy annular plaque on the face is (LQ)
|B||Potassium hydroxide mount|
|D||Wood's lamp examination|
Itchy annular plaque lesions on the face suggests fungal etiology (T. faciei)
• KOH preparation is performed on scraping skin lesions, KOH being alkaline solution digest all cellular material and debris, fungus filaments having chitinous wall resist digation.
Tzanck smear (stained with Giemsa or Wright's stain) is a cytologic technique most often used in diagnosis of herpes virus infection [simplex or varicella zoster] and pemphigus.
Diascopy- to assess whether a skin lesions will blanch with pressure as examples in determining whether a red lesion is hemorrhagic or simple blood-filled.
1). Hemangioma - blanching with pressure present
2). Necrotizing vasculitis - blanching with pressure absent
3). Granuloma - shows "apple jelly" appearance on diascopy
Wood light - A wood's lamp generates 365 mm ultraviolet light can be used to aid the evaluation of certain skin disorders.