Recurring bump on labia. no itchiness or pain, just a little discomfort

I have the same problem recently. I haven’t been sexually active in about 6 months but about two months ago I noticed a day or two after shaving the left side of my labia was alittle sore. ( in the area I shaved so I figured hair was growing back) i could feel the hair around it so I let it go. Then a few days later a small bump appeared and it seemed to get bigger as days went on. I squeezed it but nothing came out. After about 2-3 days it Went away. Then after shaving again I noticed it came back the same way with alittle discomfort then the small bump appears in the same spot. Then it slowly shrank and was gone in 2-3 days. No itchiness or pain just alittle discomfort. It almost felt like an ingrown hair but it went away on its own and nothing happened when I squeezed it. I think it’s comming back again this being about 2 weeks later maybe less. I just shaved 2 days ago and the same problem is occurring. I was tested for all stds/stds and was negative and haven’t been with a partner unprotected since. anyone know what this could be?