Types of Acne

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• Whitehead. If the plugged follicle stays below the surface of the skin, the lesion is called a whitehead. They usually appear on the skin as small, whitish bumps.
• Blackhead. If the plug enlarges and pushes through the surface of the skin, it's called a blackhead. The plug's dark appearance is not due to dirt, but rather to a buildup of melanin, the skin's dark pigment.
• Papule. The mildest form of inflammatory acne is the papule, which appears on the skin as a small, firm pink bump. These can be tender to the touch, and are often considered an intermediary step between non-inflammatory and clearly inflammatory lesions.
• Pustule. Like papules, pustules are small round lesions; unlike papules, they are clearly inflamed and contain visible pus. They may appear red at the base, with a yellowish or whitish center. Pustules do not commonly contain a great deal of bacteria; the inflammation is generally caused by chemical irritation from sebum components such as fatty free acids.
• Nodule or Cystic Acne. Large and usually very painful, nodules are inflamed, pus-filled lesions lodged deep within the skin. Nodules develop when the contents of a plugged follicle have spilled into the surrounding skin and the local immune system responds, producing pus. The most severe form of acne lesion, nodules may persist for weeks or months, their contents hardening into a deep cyst. Both nodules and cystic acne often leave deep scars.
• Acne conglobata. This rare but serious form of inflammatory acne develops primarily on the back, buttocks and chest. In addition to the presence of pustules and nodules, there may be severe bacterial infection.