Yes, Norflox TZ (which contains norfloxacin and tinidazole) can sometimes cause an allergic reaction called a fixed drug eruption. This typically begins with a burning sensation and leads to dark marks, often around the lips. While these spots can be stubborn, they are usually not permanent and will gradually fade over time. I recommend that you stop taking this medication and consult your doctor. They can provide a safer alternative for your diarrhea and suggest a mild cream to help your skin heal.
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Can taking Norflox TZ for diarrhea cause a burning sensation and permanent dark marks on the corners of my lips?