Trying to determine if now is the time to see a dermatologist. I got a sore on my right hand more than a month ago and it s not healing and I also have a sore on my left hand that is not healing either that when I haven t had quite as long. The concern is they re both very round and I have had skin cancer on one of my hands before and I don t recall which one it is so I just was trying to look up I forgot the name of the cancer that is the bad one how do I tell what melanoma looks like? The cancer spot I had removed on my hand previously was a basal cell so it wasn t of any danger. However I used to be a sun worshipper for many many many years and have been treated several times for pre cancer which is absolutely a miserable treatment