Use a good medicated face wash meant for oily skin atleast twice in a day and follow it with an alcohol free toner and a water based moisturiser. Apply gel based sun screen while going out. Drink adequate amount of water and take healthy nutritious diet. This would take care of excessive oiliness and darkness over your face.
As far as acne and scarring is concerned, there are many treatment options available to treat acne and scars
including oral and topical antibiotics, isotretinoin
, chemical peels
and microneedling etc. Simply using deriva cms is not going to solve your problem completely. Consult a dermatologist
so that severity of your acne and scarring can be assessed and a proper treatment plan can be suggested. Take care.