This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of Skin, Subject name: Skin
Comedones are seen in : 
Select and explain. 
A. Pityriasis, B. Lichen planus, C. Adenoma sebaceum, D. Acne vulgaris
D: Acne vulgaris
Answer: D: Acne vulgaris 
Explanation: 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