Thanks for writing in.
The condition you are suffering can be macular amyloidosis/lichen planus pigmentosus
Treatment can be given only after confirmation of diagnosis.
Few procedures like skin biopsy
can be helpful for diagnosis.
They are available at dermatology clinics.
Images will help a lot in establishing diagnosis.
Images can be uploaded by users in premium questions area.
Please consult a good dermatologist
for proper examination and prescription medications.
Hope this helps.