Hi dear, welcome to HCM, Thanks for your query. A ret cream can work for acne as well as marks Black marks is quite a common problem. For now, what you can do is to use a face wash with salicylic acid, like( saslic face wash.)which helps to remove those marks and new tissue grows. If problem persists, consult a dermatologist. you can prevent acne by avoiding oily spice foods ,washing mouth frequently with face wash & also don`t use any cream or lotion on face as it block glands ,leading to formation of pimples ,.A ret cream can be used at night only. ‘Hope I have answered your query, I will be available to answer your follow up queries, “Wish you Good Health and trouble free speedy recovery”