Lip swelling can arise from many causes — trauma, insect stings, allergic reactions, infections, dental problems, burns or medication reactions. This page provides general, non-medical guidance on likely causes, red flags that need urgent attention, and which specialists may be asked to evaluate the issue.
Swelling of the lips may follow direct injury (blunt force, biting), insect or bee stings, contact reactions to cosmetics or foods, viral or bacterial infections (for example cold sores or cellulitis), dental or oral infections, burns, and reactions to some medications. In a smaller number of cases, systemic immune responses such as angioedema can be involved.
Some signs with lip swelling require prompt medical assessment. Seek emergency services if there is any breathing difficulty, trouble swallowing, rapid enlargement of the swelling, spread to the face or neck, high fever, altered consciousness, or severe pain. These features can indicate a potentially serious condition and need immediate evaluation.
The specialist who evaluates the swelling depends on the suspected cause. Emergency physicians handle acute, severe cases. ENT (ear‑nose‑throat) doctors, oral and maxillofacial surgeons, or dentists assess dental or structural mouth problems. Dermatologists review skin or contact reactions. Allergists investigate suspected allergic causes and guide testing options.
Assessment usually begins with a medical history and physical exam: timing of onset, any recent trauma or exposure to potential allergens, accompanying pain, fever, or sores. Based on findings, clinicians may order blood tests, cultures, allergy testing, or imaging such as X‑ray or ultrasound. Further tests and follow‑up depend on the identified cause and the specialist’s recommendations.
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