An adult presents with oval scaly hypopigmented macules over chest and back. The diagnosis is:
Pityriasis Versicolor (PV) Etiology:- Malassezia furfur (earlier classified as Pityrosporum ovale), a commensal yeast. Pathogenesis:- PV represents a shift in the relationship between host and resident yeast flora, the yeast overgrowing in hot and humid conditions. Releases carboxylic acid which causes hypopigmentation due to reduced tanning of skin. Clinical Features:- Symptoms:- Asymptomatic. Morphology:- Hypopigmented, (less frequently erythematous or hyperpigmented, so called versicolor) scaly, and perifollicular macules. Frequently coalesce but invariably the perifollicular character of the lesions is retained at the periphery of the lesions. Scaling is branny and can be accentuated, if the lesion is scratched (e.g., with help of a glass slide). Sites of predilection:- Upper trunk, often spreading to the neck and upper arms. Ref:- NEENA KHANNA; pg num:-291
Leprosy
Lupus vulgaris
Pityriasis versicolor
Lichen Planus
Skin lesions and disorders of pigmentation