Welcome and thanks for posting your query to HealthcareMagic.
As per your query you have red bump on vaginal opening with itching, sore to touch and watery pus discharge.
The characteristic feature appears to be problem folliculitis
. This is a common problem due to simple infection in the skin causing redness and pus.
You have not told your age and the time since the problem is present. Even then go for blood sugar check up. If it is normal then there is nothing to be worried.
Do not scratch or even try to touch the area unnecessarily, apply any antibacterial cream such as fucidin or mupirocin
2 times a day in a very thin layer so that it should not be visible to naked eye. You can take a course of antibiotic such as ciprofloxacin
for 5 days along with pain killers.
The things will be totally alright by simple measures so do not worry.
I hope these information's will help you. If you have further queries I will be happy to help.
"Wish you good health"
Dr Sanjay Kumar Kanodia
MD (Dermatology and Sexually Transmitted Diseases)