Without a clinical evaluation it may be difficult for me to determine the exact cause. It could be either a cyst, wart, ingrown hair or herpes. A cyst is a closed pocket which may be filled with air, fluid, pus, or other material. A vaginal cyst is a closed sac on or under the vaginal lips.Vaginal inclusion cysts, Garteners cysts are few common cysts on the vagina. An ingrown vaginal hair may cause a painful red bump that may look like a pimple. There may be pus in the bump and it is itchy. Herpes can form painful blisters on the genitals. It is best to get this lump examined by a doctor. Do keep me posted.
Best luck and regards!
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