I'm no doctor, but think I have one. Its located where my leg meets my body, and isn't massive....you have to feel before you realise. I also feel it when lifting...is it acceptable to just accept and leave it, or will it 100% require attention?
I've the same thing I think..adj to my scrotum on the top of my leg. I was quite shocked when I first saw it but it's been the same for about 5yrs now and doesn't cause me any issues at all. Please update if you decide to do anything about yours. Thanks