Pustules are small, inflamed, pus-filled, blister-like lesions on the skin surface.
Pustules are common in acne. They may occur anywhere on the body, but are most commonly seen on the face, shoulders, back, and over the breastbone, and in areas of increased sweating such as the groin and armpit. Pustules may be a sign of a bacterial infection, and should be checked by a doctor.
Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.