I had a pimple like bump show up on my inner thigh. It was dark and about the radious of a dime. It was drak like a blood clot, but a big bump. I had it once on my inner bicep and it was two next to eachother (when it was on my arm)...what could it be? I sterilized a sewing needle and stuck it in trying to pop it and nothing but blood came out....a few days later it leaked totally out.