Which of the following is a common sign of acne?

Pimples or blemishes are a hallmark sign of acne. Acne primarily develops when hair follicles become clogged with oil, dead skin cells, and bacteria, leading to inflammation. This results in various forms of breakouts, including whiteheads, blackheads, and red, inflamed pimples. The visibility of these lesions on the skin surface is what typically characterizes an acne condition. Recognizing and understanding these primary manifestations is crucial for effective identification and treatment of acne. Other skin conditions may present with different signs, but the presence of pimples or blemishes distinctly identifies acne.