This could be a Bartholin's abscess or cyst. There are glands in the vaginal lips called Bartholin?s
glands. These can become painful and swollen, and an abscess can form. This often causes blockage in the main
duct from the gland, and a cyst develops. This is felt as a painless, hard swelling. In such cases,
antibiotics may be helpful, or surgical treatment might be required. Other possibilities are boil, sebaceous
cysts, etc. The only way to know the confirmed cause is a clinical examination by an OBG specialist. Regards.