Acne may be mild (few, occasional pimples), moderate (inflammatory papules), or severe (nodules and cysts). Treatment depends on how bad the condition is. No one factor causes acne. Acne happens ...

Pustules are typically white and, unlike papules, they contain pus. A person may find that a pustule is tender to the touch. Nodules and cysts are larger than papules and pustules and may need ...

Cysts and nodules Cysts and nodules — the most severe type of acne — are essentially just bigger, angrier, more irritated versions of papules and pustules, the American Academy of Dermatology ...