My DH had a very bad cough several years ago and I managed to persuade him to see the GP. Thank heavens I did, because in the course of the examination the GP found a suspect mole on his back and fast tracked him for a hospital appointment. It was removed under local anaesthetic, sent to the lab, and found to be a malignant melanoma. He was called back for a further check, and they decided to remove more tissue from the surrounding area, just to be absolutely sure that there was no trace remaining. He's had no problems ever since.
So try not to worry Luckygirl - even if it is an MM, it is highly treatable. Good luck 