Hi I have this spot in the crease of my left leg/groin in the front. I had a bump there and I popped it with a needle to get the puss out. Then few days or so passed and this bruising like spot appeared. It's been maybe a month or two since then and it's still there. The skin has a little indent when I rub my finger over it. It kinda looks like when you rest your hand on the edge of a desk for a while and there's a line indention from it.
I also play sports almost every day which requires a lot of leg movement in that area, so I think it might just be a stretch mark or something... or I hope at least.
https://i.imgur.com/dTfQAmD.jpg