Please help! I have NOT had any sexual interaction for two weeks so I highly doubt I could have an STD. For two days the lips of my vagina have been very itchy and now they are red and swollen. It does not burn when I pee and the itchiness comes and goes. The only thing I can think of that would have caused this is drying off with a towel after showering at my sisters house. Maybe she washed the towel in a laundry soap that I'm allergic to? Please help!