Hi, about one month I started with a small red mark on my left index finger middle knuckle it also looked slightly bruised. Initially I just thought I had banged it. However as days and weeks have progressed the bright red patch spread and got a lot larger with a difined outline with now and again turned purple in the centre as more thine has pasted it has turned a more dull purple colour, the skin appears tougher and a little scaley. It doesn t particularly hurt it itches sometimes but then feels sore, it stings under hot water and is a little tender if I catch it. Any ideas??? Thanks