@sylvia0714,
Something that should be looked at by a doctor.
It might be nothing.
But I want you to understand something. A lot of STDs look like nothing or they look like no big deal, and that is a big part of their danger, that people don't take them seriously until the infection is a lot worse and it has been spread to a partner.
I urge you to go to your doctor or a health clinic or Planned Parenthood. It might not be much; maybe it's just an allergy. Better to know for sure.