Hello,
This darkness can be due to hyperpigmentation skin. This darkening occurs when an excess of melanin, the brown pigment that produces normal skin color, forms deposits in the skin.
Treatment involves hydroquinone, azelaic acid, corticosteroids, tretinoin cream and laser treatment. Please discuss these options with your dermatologist as they are not without side effects and a dermatologist is the best person with whom you can discuss which is the best treatment for you.
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 dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
I have read that hydroquinone is carcinogen, it has been banned in lots of countries, this should be probably the last option that a dermatologist might prescribe for the pigmentation issue and it should be applied only on the affected area. But my dermatologist prescribed me to use 4% of it all over my face and neck for 3 month at my first appointment while I am suffering for hyper-pigmentation on my upper lip due to threading! I have bought the cream but haven't used it yet for bad reviews. What should I do?