I want to back Vickie's comment up.
I had a situation where, for me, it as a post-op thing, but I had substantial groin swelling, thigh and hip swelling, groin pain...it was red, warm,....
Please, get this checked out. I'm sure the doctor will want to know what's going on. The quicker you let him see what's going on, the quicker you can get this tended to.
Don't suffer in silence.