Is it possible to be allergic

So, for the past 3 months, after I finish my period, I notice like 2-3 small bumps around my Labia majora, the first time I was worried and thought I had something after having sex with someone. Went to gyn and they said it was nothing. A month later they came back after my period. And this time they did also after my period. I wear pads and tampons bcuz I hate getting messy or scared to bleed out from just a tampon. And I’m wondering if the bumps are due to the pads... they don’t hurt or itch. But I can feel them.. anyone ? ☹️ I want to go back to dr because im scared but I haven’t been with anyone for three months but I know that doesn’t mean anything.