I just got over a virus of some kind that looked like strep but the test came back negative after they put me on penicillin which I finished 9 days ago. It eventually turned into a lot of coughing and sneezing. I m still doing both but not as bad as before. On Sunday a blister appeared on the palm of my left hand. Yesterday one just like it showed up on my left foot on the bottom of a toe. They both hurt really bad when touched. I thought both must be a spider bite. Just a few minutes ago another blister showed up on my left hand, in line with the first but on the side of my hand. I know it was not a bug bite. Is there some virus going around that could cause these blisters?