I Have A Large Bump On The Bow Of My

I have a large bump on the bow of my lip that appears every 6 months or so... the first one happend when my grandfather passed away several years ago... it does not form a cluster, but it does seem to fill with liquid, and when I accidentally pop it, it forms an awkward scab on my lip that takes a few weeks to heal. I am in the food service industry, and I feel very uncomfortable with this on my mouth. Can you PLEASE help me figure out what this is!! I have no insurance, so I have to rely on my local health dpt. For help. They have prescribe my daily aysclovier for years now, but it doesn't seem to help my ailment!! Can you please offer my your professional advice on which direction I should follow! Thank you for your time...