Dear Sir! The amount of information you have provided is suggestive of post inflammatory hyperpigmentation post acne. You may use small amount of azelaic
acid 20% cream daily at night time on the spots and a broad spectrum sunscreen in the morning on full face. In case you also have some depressions (scars), then you will have to undergo some procedural treatments like microneedling, subcision
or laser resurfacing
, depending on the type of the scars.