Hi, I ve never tried talking to an online doctor before, but about a week ago I noticed my neck muscles were sore, then 4 days ago I came down with a sore throat and a fever. I finally started taking mucinex, and a couple hours after the first dose I noticed itching on the sides of my legs. I later noticed the bumps on the left side of my leg were mirrored on the same spots on right side of my leg. The bumps became warm and tender to the touch. Is this an allergic reaction to the Mucinex or is it something else? I had a lymph node infection under my arm months ago, and these bumps feel similar and are under my arm as well. Thanks, -Greg