Acne vulgaris invloves-
Acne vulgaris is s disorder of pilosebaceous gland which predominantly affects the peripubeal population and clinically manifest as comedones, papules, nodules, pustules,and cysts and heals with scar. Ref Harrison20th edition pg 1234
Pilosebaceous gland
Sebaceous gland
Eccrine gland
Apocrine gland
Anatomy of skin