Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concern.. As per your complain acne can occur due to causes like hormonal imbalances, oily skin, bacterial infection, inflammation, clogged pores etc.. Dark spots is due to post inflammatory hyperpigmentation caused due to pimples.. I would suggest you to start washing your face with Salicylic acid and Glycolic acid containing facewash.. You can start applying creams containing Kojic acid, glycolic acid, vitamin E and arbutin over the pimples.. Azelic acid preparations are also helpful.. You can exfoliate your skin twice a week using a gentle scrub.. Take vitamin C supplements and also limit sun exposure.. You can apply sunscreen lotion when exposed to sun.. For pimples you can apply a combination of Benzoyl peroxide and Clindamycin gel over pimples.. You can also apply retinoid containing Adapelene gel at night.. Do cool compresses over the pimples.. You can also go for treatments like Micordermabrasion and chemical peeling.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.