It could be anything, and it's hard to figure out even a guess from the way you describe it, but one idea might be a cyst around an ingrown hair, or just a cyst around water and or natural body oil. It might heal on it's own if you keep from irritating your vagina for a while, keep it clean and dry, and maybe sit in a tub of warm soapy water. If it gets bigger, more sore, or red and inflamed, then you do need to see a doctor.
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