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What is Black coloured hard nodules In hair is produced by: and explain in detail?
Ans: a) Peidra hortae Ref: Text book of Microbiology Ananthanarayana8lh editionAll are superficial mycosesPeidra - fungal infection of hair with appearance of firm, irregular nodules along hairshaftBlack piedra- Peidra hortaeWhite piedra - Trichosporon beigelli.Dermatophy tes - infect superficial keratinized tissueTrichophyton - infects skin,hair & nailMicrosporum- hair & skinEpidermophyton - nail & skinMalassezia furfur - by yeast like lipophilic fungus Pityrosporum orbiculare. Causes Pityriasis versicolor (involvement of stratum comeum with macular areas of discolouration or depigmentation of skin)Tinea nigra - localized infection of stratum comeum especially palm- black/brown macular lesions byHortae wernickii