The 7 most common types of acne are: blackheads, whiteheads, papules, pustules, nodules, cysts and hormonal acne. What is Acne? Acne is a common skin condition that affects millions of people around the world. It is characterized by the appearance of pimples, blackheads, whiteheads, and other types of blemishes on the face, neck, chest, back,…