When does moderate and severe inflammatory types of acne occur?

Moderate inflammatory acne:

* Occurs when there are more than 10 inflammatory lesions (papules, pustules, nodules) on the face, or more than 5 on the back or chest.

Severe inflammatory acne:

* Occurs when there are more than 20 inflammatory lesions on the face, or more than 10 on the back or chest.

* May be associated with deep, painful nodules and cysts.

* Can lead to scarring.