Hi
Skin colour of an individual is geneticaly determined. Further darkening of your skin can occur due to various causes like sunlight,
vitamin deficiency, otc cosmetics, certain endocrine disorders and few medicines. Consult qualified Dermatologist to know reason in your case and treatment. Few Peeling sessions and strict photo protection will help. Hope this helps
Regards
Dr Vijay Adhe,
Eternis Skin & Hair Clinic,
Pune.
www.eternisclinic.com