Blister?

I recently was diagnosed with chlamydia, I took the antibiotics for it and we're doing good until fiancé and I had sex and the condom broke.... I know I will have to take the medication again however something new came up. 
I have a bump/blister on the inside of my labia minora it's not painful or itchy unless I touch it, it's pea size and I'm just wondering what it is? What's going on, has anyone had this?