Hi,
Maybe, that irritation and redness due to the harsh fabric. You can apply any skin allergic lotion into it. If you are feeling a severe problem, you must visit a dermalogiost.
Thanks.
If the swimsuit wasn't wet, it was probably just irritation from the fabric. If it was wet or you got really sweaty, it could lead to a fungal infection, but there are over-the-counter creams for that. You'll know if that happens because it will itch a lot.
More likely just irritation, though. Give it a break for a few days and see if it goes away. (and please do not upload pictures of your genitals here - it's not allowed.)
By the way, I was not swimming. I just wear them around the house sometimes.