I Have A Red Bump On The Right Side Of

I have a red bump on the right side of the labia majora. I been sexually active with my husband for 3 years now. In the past, this had never happened with me. I went on a trip for 2 weeks and when I came back, that's when I started having this. It's only one pimple. First I had it and it popped and then a month later it came back again. After that popped, it came back again. The pimples are happening in different areas. I have been soaking a paper towel in warm water and putting it on the pimple and it has gotten smaller in size. It's still red. It only hurts when touched otherwise you can't even tell that there's a pimple. I do the soaking twice a day. I tried squeezing it and white pus came out. Is it anything serious?