Lip augmentation looks simple from the outside. A beginner is smart to ask about the risks before asking about the look.
The risk statement from the regulator
www.fda.gov says any dermal filler can cause temporary side effects, permanent side effects, or both. That sentence is the baseline, and it applies to every filler, so it is worth keeping in mind when you compare options.
Free reading on complications
Reading costs nothing. A journal article titled complications in lip augmentation covers the topic directly. One review looks at hyaluronidase for dermal filler complications, with applications and dosage recommendations. For a broader view, see the injectables overview and the FDA page on dermal fillers.
The step you can take and the one you cannot
The step you can take is to write down your questions about side effects. The step you should not take on your own is injecting or sourcing filler yourself. That belongs to a licensed professional.
Ask before you book
Raise risks before you commit to anything. Put your questions to a licensed clinician and let the answers guide your decision.