I have a large lump on the left side of my shin bone on left leg. I had been standing for four hours, first doing gardening; then chores in the kitchen when I began to feel discomfort but not pain in the aforementioned area. It's hard and has a purple cover the size of a half dollar that covers the lump. It does not look like a spider bite. My concern is that it could be a clot; however, it's quite hard to the touch. I have taken no medication. I have kept it elevated andi iced for more than an hour but the lump is the same. What do you advise. I have NEVER had anything like this before on my extremities or anywhere....except at the age of 12 when I had a hard cyst on my right rist from sports. What do you think this could be and what do you advise I do. Thank you!