Whiteheads, also known as closed comedones, are a common type of acne characterized by small, white bumps on the skin. They occur when pores become clogged with oil, dead skin cells, and bacteria, but unlike blackheads, the pore remains closed. This closure prevents the contents from oxidizing and turning black, hence the white appearance. Whiteheads can appear anywhere on the body but are most commonly found on the face, neck, shoulders, chest, and back. Understanding whiteheads is crucial for effective prevention and treatment, as they can be persistent and sometimes lead to more severe forms of acne if not managed properly.