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I have gone through your case. Please do not try any more home remedies as we do not know these can react with skin and in such condition, the skin will be initially red and later heal by more hyperpigmentation. So please avoid these. Just apply sunblock like Neutrogena with SPF 30 or 45. Use it 20 minutes before going into the sun and repeat after every 2 to 3 hours as it gets wasted and washed. Use sun protection like hats. Apply 2 % Hydroquinone only at the dark spot at night only for two hours. Do not take too much or you will have burning or if touch surrounding skin it will be also hypopigmentation. So use it if you are careful. Three weeks treatment.
For more information consult a dermatologist online --> https://www.icliniq.com/ask-a-doctor-online/dermatologist