SkinKraft tells you all about the causes, treatments and prevention techniques of pustules - those pus-filled reddish pimples. Pustules are large, pus-filled pimples. In this article, we discuss the causes and symptoms of pustules. We also look at treatments and home remedies to get rid of them. Acne pustules are red, inflamed pimples with white heads filled with pus. They occur when pores become clogged with oil, bacteria, and cell debris. Learn how to prevent and treat them with topical, oral, or photodynamic therapy. What is a pustule Pustule is smaller than 5–10 mm inflamed, pus-filled, blister-like sores (lesions) on the skin surface. Pus can indicate bacterial, fungal or viral infection Some pustules are sterile and are due to inflammatory skin disease Pustules are common in acne and folliculitis (inflammation of the hair follicle). They may occur anywhere on the body, but are most commonly seen in these areas: Back Face Over the breastbone Shoulders Sweaty areas, such as the groin or armpit ...