Strange blood red lump on finger

I have this blood type lump on my small finger just under my nail. It's not painfull but abit tender when I bang it. I have had it now for about 8 weeks. It started as a small red bit of blood under my skin. It got bigger quite quick, I popped it and it blead, but got bigger. Now it is as big as a pea, but dosn't bleed. Seen two doctors and a orthopeadict, all don't know what it is. I am having it removed soon hopefully but is getting bigger all the time and is very worrying. If anybody has had anything similar or knows what it is please reply.