Okay so my vagina....

My labia minora; vagina lips, have been itchy and sore for the last week, maybe even a week and a half. I have only one partner, my SO, so I know it's not an STD or anything like that. I don't think it's a yeast infection bc nothing abnormal is coming out of me. But they have just been real sore and also itchy but I don't know why!!! And I don't have sex too often so it wouldn't be from getting too rough. Does anyone have any ideas??