Such type of craters can be due to sunken scars. Unfortunately for this type of scarring or pitting, there is no medical cream as such which can treat it but surgical excision by a good plastic surgeon, collagen filling and laser resurfacing have given promising results.I would therefore recommend these two.All the advertised creams which claim to treat it are an eye wash and although tough for you,but the condition can be treated only from a plastic surgeon or a cosmetologist/dermatologist. Please consult them for these pits.
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.