How is there a thing like blister outside urethral orifice to return a responsibility

Urethral external orifice has a blister-like things may be related to urethritis, allergies, genital herpes and other reasons.

1, urethritis

with urethritis, due to inflammation on the local stimulation, may lead to increased secretions, due to secretions in the urethral external orifice accumulation, so it will form something like blisters.

2, allergies

If the underwear cleaning solution or material allergies, may trigger allergic reactions, stimulate the body immune system to release some chemicals, the urethral external orifice stimulation, resulting in local things like blisters.

3, genital herpes

genital herpes is caused by herpes simplex virus infection, blisters can appear around the genitals, mainly due to viral stimulation.