Hello, please revert back with a photograph of the black boils you are having. To prevent darkening of the skin use sunscreen of 30+ SPF. Reapply every 2-3 hrs. Apply it 30 mins before stepping out in the sun. Use umbrella or scarf as extra protection. There are skin lightening creams available, you can ask your dermatologist about the same. Avoid OTC fairness creams as some of them contain steroids. Hope this helps you. Warm regards, Dr Pinanky Jadhav, Eternis Skin & Hair Clinic, Pune
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