I had blood in my urine and was put on an antibiotic, which then caused a yeast infection. I was leaking urine for several days and had to wear a pad. Now I have a sore on my labia, and it is tender, epecially when it is rubbed by my underwear. What should I do?
Thanks for posting your question. Although I'm not a doctor and cannot give you medical advice, I have had many yeast infections, and think I can help.
It sounds like the antibiotics the doctor gave you were maybe a bit too strong. Yes, it's possible you have a sore on your vagina because of irritation and chaffing, but it could also be a different problem. How long has this been going on? If it's been more than a few days, I would recommend going back to the doctor. He or she can take a look to see what kind of sore it is and give you proper medical care.
In the meantime, I would avoid irritation by wearing skirts or dresses as often as possible and ditching the panties whenever possible as well (obviously not if you're still leaking). If you're worried that the sore may be herpes, you may want to check for other symptoms here. I've also written a SharePost about Genital Herpes and Yeast Infections.
Hope that helps!
Vaginal Yeast Infection Prevention
How to Treat Recurrent Vaginal Yeast Infection