Lasers, peels: Post inflammatory hyper pigmentation can occur in skin after injury or acne. The best prevention is to avoid sun exposure (sunscreen) to avoid stimulation of the pigment cells (melanocytes). Once present, bleaching agents such as kojic acid or hydro quinone along with retinoids can help. Typically chemical peels or laser tx is needed for severe cases.
Answered 4/24/2015
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