What is the reason for a hard lump at the vaginal opening of a woman?

Patient's question:

No

Doctor's answer:

It could be an abscess near the vulva. If it's just a red, swollen, painful lump without any systemic fever or other symptoms, it may heal on its own within a few days. If the abscess is large and contains pus, it's advisable to go to the hospital for incision and drainage under sterile conditions.