Hi I tested neg 4 std. But 2day I got open wound on outside vagina. Why? Does I can get broken vagina skin without std? Plz explain

Twelve STDs. I am not sure how to respond to your question about testing for stds. There are twelve stds that are common. But, a 'wound' on the outside of the vagina is not indicative of an std unless this could be herpes. Herpes is diagnosed by site or by blood testing. The test can take twelve to twenty-four weeks to turn positive.