Your description sounds alarming....I would advise that you have a dermatologist examine the dicolored skin to determine what it is.... I would have concern of amelanoma as a possibility...
I hope this informaiton is helpful to you. If you have furtrher questions then let me know and I will be happy to get back with you.
If my answer has bene helpful and to your satisfaction then please remember to leave positive feedback. That would be very much appreciated. Thank You and Best Regards,
Anthony Bray MD