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Signs and Symptoms

The first sign of acne is comedones. They appear most often on the face, chest, back, and shoulders. Bacteria populations can grow quickly in comedones. If the follicle wall ruptures, an inflammatory lesion develops. Redness, swelling, and pus-filled lesions accompany infection.

Inflammation that persists can result in the formation of a large, often painful acne cyst or nodule (collection of inflammatory cells). When a cyst heals, it can leave a pitted, discolored sc...Read the full article