Acne is a common skin condition that affects many people, particularly during adolescence. It's generally characterized by pimples, blackheads, whiteheads, and sometimes cysts or nodules. Here's an overview of different types and related conditions:

1. Acne Vulgaris: The most common form, usually affecting the face, back, and shoulders. It's characterized by clogged pores, which can lead to pimples, blackheads, and whiteheads.

2. Cystic Acne: A severe form of acne where deep, painful cysts form under the skin. It can lead to significant scarring and requires more aggressive treatment.

3. Hormonal Acne: Commonly linked to hormonal changes, such as those during puberty, menstruation, or pregnancy. It often appears along the jawline and chin.