There's definitely risk but no guarantees. Getting a tattoo could cause your CRPS to spread...or it could not. As Spike said...what it really comes down to is whether it is worth the risk. If worst case scenario happens...will you still be happy you got it? I know some people have gotten tattoos after CRPS and they did not have spread or worsening pain...and others did. Only you can decide if it is worth it to you.