Is it true that some people can't have lip fillers?

Lip fillers are usually a good choice for most people and allergies and/or intolerances are rare. Swelling and/or lumps can be typical and generally resolve in 1-2 weeks. Perhaps another filler, like Restylane, would be a better choice. I hope this helps. 

Thank you for your question,
Generally, it is not true that certain people are at a higher risk for lumps after lip fillers. Most individuals are good candidates for lip fillers, and allergies are rare. It can take up to two weeks for lumps to resolve after lip injections. If you are unhappy with your results, you can have the filler dissolved with hyaluronidase. Best of luck.

thankyou for your question.
 the fact that you had lumps doesn't mean you unable to have filler.
 Lumps in lips can occur due to injecting too superficial or too much in a spot . If you have a cold immediately after the filler this can cause the lumps .
You can still have filler but i would wait at least 3 months until you try again.

Hope this helps