Can acne cause post-inflammatory hyperpigmentation?

Inflamed acne can stimulate extra pigment production or move pigment deeper into the skin. The result is a flat area that looks darker than the surrounding skin after the spot has settled. This is post-inflammatory hyperpigmentation, or PIH. It is different from an atrophic scar because it does not form an indentation, and it differs from post-inflammatory erythema, which is mainly red or pink.

Picking, scratching, repeated irritation, and ultraviolet or visible light exposure can make the contrast stronger or prolong fading. A dermatologist can confirm whether pigment is the only change and look for ongoing acne that needs treatment.

Control active acne and leave lesions alone as they heal. Use a gentle cleanser, moisturiser, and broad-spectrum sunscreen; tinted protection may help limit visible-light-related darkening for some people. Avoid unregulated bleaching products, abrasive scrubs, and steroid creams used without advice. A dermatologist may recommend carefully selected ingredients or procedures after considering your skin tone, sensitivity, and whether acne is still active.

Seek dermatology advice if dark marks keep appearing, are widespread, do not fit the pattern of healed acne, or are accompanied by a changing mole, itching, pain, scaling, or bleeding. Prompt assessment is appropriate for sudden widespread colour change, facial swelling, pus, severe pain, or fever.

Ask whether the marks are PIH or another condition, which acne plan will prevent new pigment, whether a lightening ingredient is safe for you, and how to protect the area during treatment.