Virus? Herpes?: Probably not canker sores. Ciprofloxacin doesn't cause this side effect, or at most very rarely; and certainly not 4 weeks later. Also unrelated to your UTI. This sounds like initial herpes, or some other virus; or perhaps an allergic reaction to something else. See a doctor ASAP, the sooner the better for most accurate diagnosis -- and, if herpes, effective Rx must be started promptly. Good luck!
Answered 4/2/2018
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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