3rd lecture for third year mycosis

Mycosis: means fungal diseases .as fungi grow slowly mycosis may be chronic. Mycosis are classified into the following categories:
1-The Superficial Mycoses 2-The Cutaneous Mycoses 3-The Subcutaneous Mycoses4-Dimorphic Systemic Mycoses 5-Opportunistic Systemic Mycoses
1-Superficial mycosis: These are superficial cosmetic fungal infections of the skin or hair shaft. No living tissue is invaded and there is no cellular response from the host. Essentially no pathological changes are elicited. These infections are often so innocuous that patients are often unaware of their condition.
Malassezia infections
Description
Malassezia furfur is the causative agent of Pityriasis versicolor, Pityriasis folliculitis and it has recently been implicated as a causative agent of seborrhoeic dermatitis and dandruff. It has also been recovered in blood cultures from neonate and adult patients undergoing lipid replacement therapy. M. furfur is a lipophilic yeast living on the skin as part of the normal flora.
Pityriasis versicolor: This is a chronic, superficial fungal disease of the skin characterized by well-demarcated white, pink, fawn, or brownish lesions, often coalescing, and covered with thin fine scales. The colour varies according to the normal pigmentation of the patient, exposure of the area to sunlight,