<prompt> Acne vulgaris involves-Sweat glandsSebaceous glandHair folliclesCeruminous glands  <response>: Acne vulgaris is a disorder of sebaceous glands. Acne vulgaris is a skin condition that occurs when hair follicles are blocked with dead skin cells, bacteria, and oil sebum. ... Causes Hormonal changes in pregnancy or from the menstrual cycle. Some medications. Ceain cosmetics and lotions. High humidity and sweating. Polycystic ovary syndrome PCOS Ref Harrison20th edition pg 1234 