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It is best not to dry underwear in the bathroom, as it is humid and easy to breed bacteria in an unventilated environment. It is best to dry in the sun, or at least in a ventilated place.
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Wash and dry quickly.
Then just put it away.
No, HIV is transmitted through blood and body fluids, and the HIV virus has a short survival time outside the body, so it is impossible to transmit it in places such as public toilets.
No, toilet drain pipes are generally very wide, and a pair of underwear that falls into it may quickly end up in the sewage pool through the pipe.
No, the itchy urethra is inflammation. Second, there is a foreign body.
It's okay, just go home and wash it with clean water and change a pair of underwear. You won't get infected with germs.
Yes, you need to be treated as soon as possible.