question: Hi. I am 41 years old, healthy and exercise regularly. I had an area on my left inner calf just below the knee that was itchy. The itch went away but there is a hard knot that is getting larger and bruising that is spreading as the day goes by..it went from 1/2 inch to 2 in diameter today alone. It s dark blue/black and the center is turning red/purple. The leg aches in that area and the knot is painful to the touch. I have a 24 year history of Idiopathic Thrombocytopenic Purpura. Is this knot and bruise anything to be concerned about? I suffered no trauma to the area that I can recall. I m concerned about blood clots. Thank you.