Tinea versicolor is caused by which of the following? (AIIMS May 2009)
a. Tinea versicolor (pityriasis versicolor) is not a dermatomycotic condition but, rather, a superficial mycosis now thought to be caused by M. furfur. The disorder is characterized by chronic but asymptomatic scaling on the trunk, arms, or other parts of the body.
b. Dermatomycoses are cutaneous mycoses caused by three genera of fungi: Microsporum, Trichophyton, and Epidermophyton.
c. These infections are called tinea or ringworm, a misnomer that has persisted from the days when they were thought to be caused by worms or lice. Tinea capitis (ringworm of the scalp) is due to an infection with M. canis or T. tonsurans.
d. It usually occurs during childhood and heals spontaneously at puberty. Circular areas on the scalp, with broken or no hair, are characteristic of this disorder. Tinea corporis (ringworm of the body) is caused by M. canis and Trichophyton mentagrophytes.
e. This disorder affects smooth skin and produces circular pruritic areas of redness and scaling. Both tinea cruris (ringworm of the groin, “jock itch”) and tinea pedis (ringworm of the feet, athlete’s foot) are caused by T rubrum, T mentagrophytes, or E. floccosum. These common conditions are pruritic and can cause scaling.