Labia minora pimple pain. And again?

Got swell last month with pus in labia minora along with pain no white discharge fever was there went doctor had done physical examination and she said it's infection and gave antibiotics and it's resolved now again I got pimple in same right labia miniora with minimal pain and itching and also with lower back pain want to know why it's repeating again and again? Is it related to cancer do I need to worry about as it's serious concern if not will it have permanent cure attaching doctor prescription for reference and also observed it facing this is after a day intimating with my husband and just want to say got heat bubble on upper lip is it related to heat worrying a lot that is it related to cancer or what Regards Mounica