What should you know about right upper lip swollen?

A local reaction can occur after a bite, food contact, cosmetic, dental work, or minor trauma. Tenderness, warmth, pus, a toothache, or spreading redness may suggest infection and needs examination. Angioedema causes deeper swelling that can appear suddenly and may affect the lips, eyelids, tongue, or throat. The side involved does not identify the cause.

Stop any newly introduced lip, dental, or facial product and avoid suspected trigger foods until assessed. Use a cool compress wrapped in cloth for short periods, and do not squeeze or puncture the area. Photograph the swelling and record its onset, accompanying symptoms, medicines, and recent foods. A clinician may assess the mouth, teeth, skin, and airway; angioedema is one possible condition to discuss.

Call emergency services immediately if swelling affects the tongue or throat, breathing becomes difficult, swallowing is hard, the voice changes, or you feel faint. Seek same-day medical advice for rapidly increasing swelling, hives, vomiting, severe pain, fever, or a dental source. Do not wait for a lip reaction to settle if airway symptoms are present.

Could this be angioedema or a local infection? Which triggers should I avoid? Do I need an emergency plan if it happens again, and should my medicines or dental health be reviewed?