What you are having is whiteheads and blackheads and atrophic scars causing pitting. It is caused by excess oils that have accumulated in the sebaceous gland's duct.
Cleanse the area thoroughly and apply a good mild exfoliating scrub on that. Apply a medicated cream or gel containing resorcinol, salicylic acid or benzoyl peroxide. This helps is soaking the oil and helps in peeling away the blackheads.If benzoyl peroxide leaves your skin dry, apply an oil-free moisturizer after 10 mins of applying benzoyl peroxide.
For the pits, dermabrasion, chemical peels, collagen fillers and laser resurfacing can be tried. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.