Its bad for your fingers, you can get arthritis sparring it's possible. This is why i strongly suggest auto spar, i kinda afraid to even post this because i would get ban for trolling for like the 4th time but, even if this "Might" be a troll least i ain't lying!
Lets get started.
PC
If you spar on pc you have like a 40% of getting arthritis in your fingers or hands over that fact of it crossing your hands and finger smashing those poor arrow keys can really deflect the fact of getting arthritis its too fast and the reaction time is too. How can we prevent having that happen?
Android/ios
Don't even let me get started on android/ios can do to your fingers, you can go full arthritis on the mixing on pads doing so, could get you arthritis by like least a whole as 60% Which isn't good depending on your determination, i would add a crackhead powers joke, but i'm mostly likely to get banned, moving on the fact this isn't healthy not even a little bit.
Summary
Yo stop messing up cho fingers.