What to do if your face swells after collagen filler injection
Facial swelling after collagen fillers is usually a normal phenomenon, as the procedure may damage the skin and mucous membranes, leading to local congestion and edema. Swelling after collagen filler injections can be improved through physical treatments or oral medications, as detailed below:

Cold compress: Cold compresses can be applied within 24 hours after the procedure. Wrap an ice pack in a dry towel and gently place it on the face for 5–10 minutes.
Warm compress: After 48 hours, apply localized warm compresses. Place a warm, damp towel over the face for 10 minutes, once daily.
Topical medications: For severe swelling, apply blood-circulation-promoting and stasis-resolving ointments as directed by a physician. After application, massage the area to enhance absorption and effectiveness of the medication.