If you're prone to infections (you'll know because you'll get them all the time), a bathing suit that's wet can really increase your risk. But you don't have to skip the swim. Instead, change into dry bottoms as soon as you step out of the pool. And because ill-fitting bikini bottoms can reduce air circulation in the crotch area, which can also set you up for infection, make sure your bathing suits fit properly — the edges shouldn't leave indentations on your skin. A little give can also prevent sweat gland blockage and the itchy red bumps that result from it, Dr. Zeichner says.