I used Monistat 1 (tioconazole) for a yeast infection (after spending weekend at a waterpark) and a few days later ended up with painful white sores. What are they?

Sores. Please see a doctor while the lesions are still present so an accurate diagnosis can be provided. It's important for the lesions to be evaluated asap so an accurate diagnosis can be rendered.
See a doctor. Although these sound as if they may be herpetic (genital herpes), they should be examined by a professional to be sure.

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