I have this big lump on my middle finger at the top joint. It appeared about 6 weeks ago and was a small bump and has progressively got bigger and now it's very sore. It's about the size of a marble now.
First doctor said it was a blood blister so used a needle and drained it. Not much blood came out and we wrapped it up. It was the same size next day, only sore.
Second doctor said it was a ganglion cyst and tried to drain it again and it was just all blood. She told me before hand that cysts are full of clear stuff so was a bit surprised when dark blood came out. Still insisted it was a cyst and that I will need to have it removed via surgery.

So now I am left with a big, purpleish blue lump that is very sore that won't seem to go away. I have googled every cyst imaginable and none look like this. I don' believe it is a cyst nor a blood blister. Any ideas on what it could be?