Yes, celeb, I have. About 8 years ago, my doctor sister noticed a new 'mole' on the back of my neck and said it might or might not be a melanoma. My doctor and the dermatologist said the same thing but she took a biopsy to be sure - and it was. I got a very quick appointment at the plastics dept at the Christie Hospital in Manchester and a chunk of muscle was dug out under a local anaesthetic. It turned out to have been the thinnest melanoma they had ever seen. 0.1 millimetres. So it pays to get quick action and I hope yours turns out to be 'just a mole'- but you can't be too careful. Good luck. 