anything I can do to prevent bump inside labia minora?

Hi,
Welcome to ehealthforum,
It is difficult to comment on the symptoms (bump inside labia minora along with other associated symptoms) that you describe without examining you and going ahead with getting further evaluation done for you to look for the underlying cause. It could be due to folliculitis, infected Bartholin’s gland duct, infected paraurethral glands, etc. You should consider visiting your doctor/gynecologist at the earliest for further evaluation. Get started on treatment as indicated (based on examination findings and investigation results). If found to be infected and still containing puss, it might need to be drained surgically. Drink plenty of water. Maintain healthy diet. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any unusual/new/abnormal symptoms immediately. Avoid vaginal douching, use of harsh soap or perfumes in the area. Use loose cotton undergarments and avoid use of tight fitting clothes. If infective cause is detected, (and if you are sexually active) get your partner also treated simultaneously to prevent chances of re-infection.
Take care.