also.i have taken vitamin c 1000mg,zinc 400mg,b12 1500mcg & multivitamin & minerals orally.i use hydroquinone,vitamin a ,hydrocortisone base cream for 4 months,but i don't find any improvement.
Treatment involves hydroquinone, azelaic acid, corticosteroids, tretinoin cream and laser treatment. Since the topical treatment has not helped, so laser treatment is an important treatment option. Please discuss this option with your dermatologist.
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.