Replying to Groin injury causes lump?

At the beginning of the season, I injured my groin while skiing.  I could barely walk right for like a month afterwards and there was a large bruise running down the inside part of my thigh.  I went to the doctor and he said the best thing I could do was take it easy, and I did and once it felt better, I started skiing again.  Recently, I found a hard, painless lump on my groin, the size of a golfball right at the top part of my inner thigh, and it is only there when I flex the muscle.  I AM GOING TO THE DOCTOR in a couple of hours, but I decided to ask in here if anyone knows what this could be.  Im thinking it is scarring from the injury, and I cant push it back in like a hernia, but thats what my parents think it could be.  I tried googling it but could not find anything useful for a lump as big as mine.