Hi Thank you for asking HCM I have gone through your query. You can use home remedies like applying honey on the dark patch at night and wash it in morning. You can add diluted lime juice also with honey. Vitamin C based creams or craems with kojic acid also will be helpful. Dermatologist prescribe creams with combination of hydroquinone , tretinoin and flucinolone for this. But while using this avoiding sunlight exposure is obligatory and should use sunscreen for better effect. Ayurvedic over the counter creams like himalaya anti blemishing cream or vicco turmeric is another option. Hope this may help you. Let me know if anything not clear. Thanks.