Lip swelling often happens to me, and i don't know why?

An allergy?: Maybe an allergic reaction. Please try and be aware of exactly what you are eating or touching with your lip before it starts.

Lip swelling: Swelling can occur for many reasons such as allergic reactions, something called angioneurotic edema, infections, and biting on your lips, just to mention a few. You should consult with a dentist in order to try to determine the cause.

Where???: It this your entire lip or just the upper or lower lip or just some portion, is there pain or discoloration...When does this happen , how long does it last. Its bpossible you have a blocked salivary dust or some form of infection i need more info to properly answer you..Would suggest you get this looked at when it occurs..Could also be an allergic response.

See a doctor: Need more information to suggest any cause of this swelling. Most common causes are allergic including aspirin, or ibuprofen, or Naproxen ingestions. However, to get to cause you need to see a board certified allergist who can help you further understand the cause.

Possible allergy: I bet its an allergy. Think about what commonalities occurred. Probably food, lip products?