If the whitening is caused by vitiligo, then topical steroid creams and topical
tacrolimusTacrolimus
Tacrolimus topical (
Protopic in the US) are worth a try, as are narrowband UVB treatments. If the whitening is caused by scarring from electrolysis, these are unlikely to work. I have seen problems (poor appearance) with inexpertly-done permanent tattoos, so I would be very careful before embarking on that course. A dermatologist using a Woods light (ultraviolet) should be able to make the diagnostic distinction.
Take care.
Dr. Rockoff