I have a large cavity on my face, was a zit but no it s just like a cavity. I have no insurance. I keep draining it using a sterilized needle. I always get very watery puss and blood out, and today a solid white puss shout out. Since then it has drained continuously the same yellowish watery puss. I have kept it clean with hydrogen peroxide and newsprint, but I am considering irrigating it with either alcohol, saline, or peroxide by injecting it into the cavity to wipe out any remaining infection. Is this safe? My mother is a trained lab tech, I will let her do the procedure.