What should one do if one has a bad cold, and their nose is stuffy, but also a little bloody, it’s very uncomfortable, but is blowing an issue of chaburah?
It depends if blowing it will almost definitely cause bleeding. If it will then it is a problem. Wait a few minutes until it will no longer inevitably cause bleeding, and then when it will no longer be considered a psik riesha, it is permitted.
See Shulchan Aruch O:C 328:49, Mishna Berura ibid se’if katan 151.