Face - First the cause of dark spots needs to be evaluated. The dark spots can be after pre existing lesions or due to lichen planus pigmentosus or acanthosis nigricans or addisonian pigmentation - there are antioxidant therapies like glutathione , lasers for rejuvenation, PRP therpy for facial rejuvenation , peels, etc. Meet any other Dermatologist/Trichologist as per your convenience and get further evaluation done. I believe there are two issues you wish to get addressed. You hair and skin... Hair- Hair loss is a progressive problem and if not tackled in time tends to keep worsening over time. There are various causes of hair fall. Read my health feed for a better detailed understanding. https://fit.practo.com/#!/content/28405 After reading this I hope you will be convinced that a proper thorough examination of your scalp from a qualified dermatologist will be advisable for a fruitful outcome. Nail - Would need examination to comment on the cause. Hope this was helpful