It is 2 weeks after bitten by 1fang of a cottonmouth snake under water, 2nd fang did not penetrate boot. The discoloration is almost gone, still some swelling in the foot and a small lump 1 inch below the fang mark. Also, foot itches , then is painful, then normal feeling. Keeps cycling. Had taken 10 days prescribed antibiotic. Could u tell me if this is normal. Thanks, joe