Debbie,
Thank you for the photo.
At this point, after all these years and topical treatments, the best thing to do would be to see a plastic surgeon and have the entire pigmented patch surgically excised.
In experienced hands, given the location of the lesion, this would be a fairly simple operation and would completely solve the issue forever.
Also this would have the added benefit of getting a tissue diagnosis from a pathologist as to what, exactly, the lesion is.
This is what I would do if I were in your shoes.
Does this make sense to you?
I am happy to be able to help you today. If you would be so kind, please help me get credit for my efforts in answering your questions and press the excellent feedback button for this encounter. And, don’t forget, I work for tips. I would also be happy to continue to answer any more questions you have until we have resolved your concern.
Dr. Rick MD FACS