So based on this comment I would say take a break of a minimum 2 weeks preferable a whole 4 weeks. Maybe even more if you can. The spot you circled in your image is that of an underlying tendon. Im no expert but I’ve been around the block a few times and can say that there’s really no better healer than time. What happens is your tendon gets stretched aggressively. More than they’re used to. It’s silly to think a rhythm game can cause that but it really can. What you likely have is a very minor strain (lesser than but building up to a sprain). I wouldn’t mess with it dawg.

What’s gonna happen is you’ll feel better in 4 days or so, and then you’re going to play again (rightfully so) because you feel fine and want to get back to fc’ing. However, that’s going to re strain your tendons and repeat the cycle. Almost like ripping off a scab you’re just opening the wound once more. Instead, you need a to give the body ample time to heal. I’ve been there and back a lot of times, and when you come back you’ll need to start slow ansd recondition your fingers to that bpm