Hello, I can understand your concern for darkening of skin since last few months. There can be multiple possibilities of the darkening of skin and to diagnose the exact entity you require meeting a proper dermatologist in person. A dermatologist will analyze the exact cause of the darkening of skin and then will give you the best treatment if the same. It can be either due to Lichen planus pigmentosus or due to post inflammatory hyper-pigmentation. Basically our skin has a susceptibility to form more color on exposure to sunlight or by self tendency also. Therefore the color producing cells called as melanocytes act on higher side to produce dark patches. In my patients I generally use a cream containing Kojic acid with arbutin cream or cream containing mild skin lightening agents. Other than this it is advisable to use a good sunscreen daily for two to three times per day. Take nutritive diet containing a lot of fruits and green vegetables which acts natural sunscreens. Protect yourself form direct sunlight as the most important measure. All the best.