Hi there Jones.
I read your problem with interest & note you have tried a sulfur wash for over a year.
Dermatology However, is a 'visual' field & as such, it is always best to upload a good clinical photograph on this site that you can do using the upload data icon to the right of your screen.
Do visit a dermatologist
on the ground nearest to you for best results.
In the interim, you may want to try a 2% hydroquinone
base cream in the evenigs applied specifically on those lines & a good sunscreen applied each morning with an SPF factor of 30-50. Bioderma has one such 'spot cream' that has an inbuilt pigment reducing molecule.
Wish you a clear countenance soon. Cheers!
Dr Praveen Rodrigues MD.