The spilling of blood in cymbal line will likely happen because far too many people aren't given direction and instruction by someone... well, period.
If you have decent technique, control, and the better part of your brain intact and functional the sight of blood caused by a cymbal within the act of performing or rehearsing should make u think, "man, I musta really f&%#ed up cuz I actually cut myself! I usually play with good technique, focus, and control and therefore don't gash myself open! I should refocus and play like I know what I'm doing cuz I look ridiculous right now like I can't handle my instrument."
Abrasions caused by straps from long rehearsals on the other hand will happen. You can either deal w/it or wear gloves that cover that part of the wrist. I believe Harbinger makes weightlifting gloves that work perfect. I marched an entire season @ Pacific Crest w/some beasty 20" Sabian Hand Hammered Germanic cyms w/no problems (well, the velcro stopped sticking after a while but that's why we have electrical tape :b).
As for armpit bruises I'm assuming those occurred as a result of playing chokes, yes? With things like that where playing the technique properly causes injury (I know it's just bruises but it's technically an injury nonetheless) you might want to consider changing the technique. I was taught to bring my chokes low enough so I don't nail my armpits and far back enough to get a complete stoppage of vibration immediately due to the amount of surface area inhibiting vibration. In short, if I aim my hands at a spot high on my hips it puts the cymbals in prime position to get a good choke by sandwiching a vibrating cym between my side and my arm. While it IS more difficult 2 get quick chokes you'll soon find yourself actually building chops cuz you'll be challenging yourself to get the speed back and the speed will be there if you work on it... it's called practice for a reason.
And lastly, as a prime example of why you don't need 2 injure yourself 2 b considered a hardcore cymballer I will explain my on-the-fly uninversion technique. Once you have a thorough understanding of how the cyms react 2 your body and vice-versa even the toughest of cymbals can be uninverted by slamming it quite hard and more importantly very accurately against the side of your hip. If you're not careful you WILL hurt yourself and get a gnarly bruise that's super-touchy. The rear part of the dome must hit the meaty part of your hip (where your thigh, butt and hip bone all meet up, the "sweet-spot"). If you do it right it
wont really hurt, you may feel a slight but short-lived sting on your mid-thigh and ribcage areas (it's just the edges of the cym snapping back into position). But if you miss and your knot hits ur "sweet-spot" THAT will b painful and the cym will likely not even uninvert, which means u gotta try again. And please don't use your knees 2 uninvert, ur begging for fractures and future knee problems.
So don't get bloody, keep the bruises to a minimum and just focus and try to use some common sense. If it hurts it can most likely be done differently.
Ugh. I got little high school girls doing multiple pit vipers in competition every year at Paramount and I can't remember the last time somebody got cut. All the injuries they've received have been a result of lack of focus on either slides or chokes. Sorry 4 the rant it just boggles my mind how many people really are like the old joke says, "Doctor, it hurts when I do this." "Then don't do that." If you're getting injured while playing a musical instrument then you need to eliminate the cause of the injury, plain and simple.
BTW, how many bandannas get thrashed every year because some genius thot they'd make a good support system for huge chunks of metal? My kids work through leather straps pretty quick even WITH grommets. My girls would run thru a bandanna b4 lunchtime easy :b I can just see it now... cym tears thru a bandana, the knot slips thru and the cym either flys into a crowd and injures a spectator or it falls edge 1st onto the cement (FYI, dings on the edge caused by such droppages is what makes your cymbals crack at the edge in case you were wondering... so please protect your edges). I thot all this stuff was common sense but I guess protecting your health and your instrument are 2 complex ideas for so many people to understand. I hear whining all the time about how people don't respect cym lines and whatnot and I'm beginning to see why myself. If you don't take pride enough in what you do to educate yourself about these things than you have no right to say you're a cymbal player IMO. It just makes you some random shmoe that thot, "wow those sure r shiny and loud so that's what I'm gonna play, ahyuck!"
Well, now hopefully some people are a tad more educated about things and may just focus and think next time. That's all I ask guys, just use your brain if u got 1.