I am a 40 year old male. One day, recently, I noticed that a large mole has appeared on my left forearm; it has appeared suddenly and I am worried. It's dark-brown in colour and is about the size of the picture of the lens appearing next to the 'Ask a question' box on this webpage. A lot of other moles have appeared over the years- tiny ones- which I've ignored. This new one is large and makes me ponder if it is a health related issue. Kindly help.