Almost a month ago now I noticed a new freckle on the thin layer of skin that connects your nail to your finger. It was very tiny but very irregular, so I decided to keep an eye on it. Because it was on such a thin layer of skin - on top of the nail - it was accidentally picked off and most of it came away. I was worried about this because I thought that if it was cancer it would be very harmful to damage it. There was a very tiny, barely visible part of the freckle still left, which has remained unchanged for weeks until last night. I woke up this morning and it has turned into what looks like a blood blister (but tiny). It looks highly irregular and I can see clearly that it has come from the freckle. 

What I'd like to know is does sound like cancer to you, and do you think I may have triggered it to spread by picking it off. I am making a doctor's appointment after the bank holiday. I'm 24.