Advertisement - Continue Reading Below. Zeichner suggests consulting a dermatologist about DIY products before using them. Any of the bleaching treatments outlined above can lead to scarring a. Zeichner, it could take two to three months of applying the product as often as twice a day to see results, which can last up to six months. Depending on the product, it may contain ingredients such as hydroquinone, azelaic acid, Kojic acid, niacinamide, or other botanical extracts, all of which chemically exfoliate dead skin cells responsible for hyperpigmentation, aka skin darkening caused by excess pigment, according to Dr. Because professionals typically use more potent lightening products that deliver faster results than DIY options, according to Svendsen, exposure to professional-grade products could increase your chance of post-treatment irritation, Zeichner says. The problem: Some chemicals in skin-lightening products, like kojic acid and hydroquinone , may be considered carcinogenic, as per data from the National Institute of Health. Expect to see results about a week after the first treatment, although you may need up to three sessions for optimal results, with touch ups every six to 12 months, Sherrill says.
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