Hello.
Thanks for writing to us.
The black lines on your skin are most likely due to a pigmentation related problem. This normally happens due to overactivity of melanocytes. The success of treatment depends on the extent of darkness of lines and their location. Your
dermatologist can help you in suggesting you a proper treatment after an examination.
I hope this information has been both informative and helpful for you.
Regards,
Dr. Praveen Tayal
drtayal72@gmail.com