Comedones are seen in :
Ans is 'd' Acne vulgaris Primary lesion of Acne Vulgaris is comedonesOpen comedones are Black Heads*Closed comedones are White Heads*Comedones can evolve intoPapulesPustules &CystsSite of Appearance (requires presence of Sebaceous gland)Face (MC)*ShoulderBack & Upper chest
Pityriasis
Lichen planus
Adenoma sebaceum
Acne vulgaris
Anatomy of Skin