I had an allergic reaction to the venom of one of these little creatures. Now, a year later the dang thing is acting up again. It's awful. I was bitten on the back of my knee, and could feel the poison spreading through the knee. Three days later the front of my knee was in huge welts. I spent some time in the hospital, but the remaining squat lump never went away. Now it feels like a boil on the inside, but although it is hot & tender there is no sign of a head. Feels like it's going into the bone. Any suggestions?