Lump on inner thigh...Please help

I have a lump on my right inner thigh, very close to the groin area...It was purplish color on the surface of the skin so I figured it might just be a boil. I decided to soften the skin and pop it. Some blood did come out, but now a hard lump that does not move remains. It is not painful upon touching or squeezing it. The size of the lump has gone down in the last two day's. I am very scared because I had testicular cancer (seminoma) 5 years ago, so any lump or bump I get, I become very worried. Can someone please offer any advice?
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