persisten pain in my upper glute - what could it be?

~3 months ago, I developed a persistent pain around my upper intergluteal cleft (fancy term for butt crack). I first felt it doing a sprinting session, I didn't really think much about it and it seemed to go away. A few days later, while I was going down some stairs, I felt it again, this time much stronger, and it accompanied me for a few days. When I tought it had passed (~4/5 days), I resumed training and it immediately came back. This time, it was not that painful so I started training on it, and over time the issue did not get worse but didn't get better either. Here comes the summer break: I didn't train on it for 3 weeks (still ran sometimes, playing soccer, beach volley etc) and it seemed to go away but now I've started my training again and I sometime feel a slight discomfort in that area. Nothing major, but I'd love to get rid of that. Has anyone got a clue on what it could be? I think it originated from a piriformis issue, as I probably had one a week before I started feeling this discomfort, but this time the pain is in a different location so I don't think it's the piriformis. The pain gets more intense when I: -bend down -stand on the right leg when I'm putting on my pants on the left leg (oddly specific, I know) -when I'm bent down, rapidly accelerating while sprinting (when I'm upright, at top speed, I feel it much less)

~3 months ago, I developed a persistent pain around my upper intergluteal cleft (fancy term for butt crack). I first felt it doing a sprinting session, I didn't really think much about it and it seemed to go away. A few days later, while I was going down some stairs, I felt it again, this time much stronger, and it accompanied me for a few days. When I tought it had passed (~4/5 days), I resumed training and it immediately came back. This time, it was not that painful so I started training on it, and over time the issue did not get worse but didn't get better either. Here comes the summer break: I didn't train on it for 3 weeks (still ran sometimes, playing soccer, beach volley etc) and it seemed to go away but now I've started my training again and I sometime feel a slight discomfort in that area. Nothing major, but I'd love to get rid of that. Has anyone got a clue on what it could be? I think it originated from a piriformis issue, as I probably had one a week before I started feeling this discomfort, but this time the pain is in a different location so I don't think it's the piriformis. The pain gets more intense when I: -bend down -stand on the right leg when I'm putting on my pants on the left leg (oddly specific, I know) -when I'm bent down, rapidly accelerating while sprinting (when I'm upright, at top speed, I feel it much less)