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Post-inflammatory pigmentation is discoloration of the skin at the site of a healed or healing inflamed acne lesion. It occurs more frequently in darker-skinned people, but occasionally is seen in people with white skin. Early treatment by a dermatologist may minimize the development of post-inflammatory pigmentation. Some post-inflammatory pigmentation may persist for up to 18 months, especially with excessive sun exposure. Chemical peeling may hasten the disappearance of post-inflammatory pigmentation.

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Removing Acne Scars With the Derma Roller
There has been some positive feedback in using the derma roller for getting rid of acne scars. These acne scar home remedies are effective, inexpensive, and can be done in your own home.
Source: ezinearticles.com