Ok so for a few years now I have this spot/lump on my left leg muscle, it appears and becomes itchy for about five minutes than dissapears quickly. Nothing really seems to trigger it, it's pretty random. It's red, itchy, looks sort of like an insect bite. But it always just goes away and comes back randomly. It can be every few days, every week or so. Is this anything to worry about? Should I go to my GP about it?