Hi, I have a purple blood filled place on my upper inner thigh. It is raised and feels very irritated when I walk and my clothing rubs against it. I pricked it with a needle and blood came out and then liquid and it still feels sore and irritated. I have had several of these for a few years now on each inner thigh and they are very painful when they swell up or whatever they do, any idea what I can do to get rid of them or what is causing them? Thanks, p.