I have found a pea sized lump on the outside of my vagina at the bottom. what could it br? its not sore no redness

Possibly a: benign bartholins gland cyst or another benign cyst. Let Gynecologist take a look if still concerned.

Various possibilitie: Wart, cyst, even a skin cancer. Without an actual examination, I cannot give specific medical advice on your particular health and Dermatologic conditions are particularly hard to evaluate without seeing them in person. Big Big point though: Every single cause mentioned.... treatable.

See doctor: or GYN to have this evaluated as there are many possibilities (cyst, wart, infected hair follicle....)