Stinging pain on the inside of right thigh?

For a little while now, I've felt a stinging pain on the inside of my right thigh, usually worsened by walking around. It feels like something has stung me. It looks like there are some red lumps there, but it's hard to tell. And right now as I sit around working on stuff, my right leg feels kind of off, like the whole leg is sore. I've noticed that when standing around lately, my right leg and foot seem to get extremely sore and tired long before the left leg does.

I do sit and lay around a lot, usually working on homework or surfing the net, but I have been walking around a fair bit lately.

I'm just curious if anyone has had a similar experience or has an idea about what this could be? I'm thinking about getting it checked out.