I mean, it seems so unlikely and I can't think what would have done it to be honest.
The pain is when I press into the left crease at the top of my thigh/front of my pubic area, where the hair grows. It is definitely pain full, like there should be a swelling or lump, but there isn't. It hurts a little when I move my leg but mostly just when I press. I only discovered it this morning drying myself after my shower but after giving it a good old poke and press it is much more sore now! 
How would I have injured my groin? 
And what should I do?