What is this on my labia? Bump or sore ?

hello guys, i am currently 5 months pregnant btw. i been getting this bump or sore for years, about the past 4 years. it comes once a year or every six months. i do shave alot and have really thick hairs. i dont see a ingrown hair on that area. my symptoms are ; itching only in that bump exactly, swelling of that lip only, no smell, no discharge, only pain when i squeeze it! it only last 3 days n dis appears completey. i ask my doctor all the time he says; ITS NORMAL women get bumps all the time. but idk what it is. herpes? but i have no symptoms . herpes outbreak? i compare it to other pictures but it looks mostly swollen. not like herpes. a cyst? but its not big enough. a pimple ? but there is no puss or bleeding. its swollen and its uncomfortable

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some one help