Hello,
For removal of tan wear sunscreens with spf 30 atleast half an hour before going out in the sun and wear cotton clothes. For tan removal, you can also get done laser resurfacing but it carries the disadvantage of being expensive and sometimes resulting in post inflammatory hypopigmentation.
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 doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
are you natually light or are you naturally tan? If you are naturally tan why are you wanting to lighten up?
If you work in the sun or are out alot in the sun you will build a tan. You use sublock 30 but a 50 or higher is best. 50 and higher is used on children here in the states and I would think that would give you the best outcome.