Hello dear Understand your concern Acne sometime produce dark spot by hyper pigmented process. You should continue the treatment till the dark spot goes away. I prescribed following advice and medicine as a treating doctor in this type of case: Apply ointment that contain: Kojic acid + arbutin + glycolic acid. It is safe and use until spot goes away. Use gentle exfoliated scrub and salicylic acid containing face wash. You can also use gel that contain vitamin E and alovera. You can use suncreen lotion when you will go outside. Drink plenty of waters. Take Vitamin C and calcium supplements or diet rich in vitamin C and Calcium (lemon juice, amla, orange, milk, egg yolk and milk items). So consult the dermatologist and take proper prescription and advice. Hope this may help you Best regards Dr. Sagar