I took nitrofurantoin for a UTI infection and finished my course on Tuesday morning. Yesterday (Friday), I noticed what appears to be hives (small raised bumps with no redness, they didn’t itch) on my legs. I counted 13 - primarily on my thighs and shins. They appear to be gone today, but after I took my puppy for a walk this morning, I noticed small red bumps on my feet and they itched. Is this an allergic reaction to the antibiotics?