Medically reviewed guide · Last updated: 5 November 2026 · Reading time: approx. 10 min

Facial Swelling: Allergy, Tooth or Angioedema?

The most common causes compared

The causes in detail

The face swells visibly very quickly because the skin on the eyelids, lips and cheeks is thin and the tissue beneath it can take up a lot of fluid. Roughly three mechanisms are behind it: an inflammation, for example from a tooth or an infection; a sudden leakiness of the blood vessels, as in allergy and angioedema; or fluid that builds up in the body. What matters for making sense of it is speed, side, pain and accompanying signs.

This article looks at the face as a whole. If mainly the eyelids are affected, the article on swollen eyelids with its eye-specific causes will help; fluid build-up throughout the body is described in the article on water retention.

Allergic reaction: fast, itchy, with hives

In an allergy, mast cells release histamine, the blood vessels become leaky, and within minutes to hours the lips, eyelids or cheeks swell. Often itchy weals appear on the body as well, as in hives. Typical triggers are foods such as nuts or seafood, insect stings, medicines such as antibiotics or painkillers, but also contact allergens: hair dyes can make the forehead, eyelids and face swell massively, often only one to two days after dyeing. It becomes dangerous when the reaction affects the whole body (anaphylaxis): breathing difficulties, hoarseness, dizziness, nausea or circulatory problems. First step: stop the trigger; with swelling of the skin only, an antihistamine such as cetirizine can help. With signs of anaphylaxis, call 112 immediately and, if prescribed, use your adrenaline auto-injector — how to do this is shown in the guide Allergy emergency kit.

Angioedema without allergy: when bradykinin is behind it

Not every sudden swelling is allergic. In bradykinin-mediated angioedema, a different messenger substance, bradykinin, builds up in the tissue. The swelling usually develops over hours, often affects the lips, tongue, cheek or throat, hardly itches and comes without hives. It typically lasts one to several days. The treacherous part: according to current knowledge, antihistamines and cortisone hardly work here, and swelling of the tongue or larynx can become life-threatening.

The most common cause is medicines, especially ACE inhibitors (see the medication angle). Less common is hereditary angioedema caused by a deficiency or defect of the C1 inhibitor: it usually starts in childhood or adolescence, takes the form of recurring attacks of swelling on the face, hands, feet or genitals, often with severe, colicky abdominal pain, and frequently runs in families. First step: any swelling of the tongue or throat is a case for 112. With recurring swellings without hives, an assessment at a specialist allergy or immunology clinic is needed; effective medicines for acute attacks and prevention are available for hereditary angioedema.

Dental abscess: one-sided, throbbing, often with fever

An inflammation at the root of a tooth or around an erupting wisdom tooth can spread into the soft tissue as a collection of pus (abscess). The cheek or jaw swells on one side and is red, warm and tender; often there was toothache beforehand, which can ease as soon as the pus breaks through into the tissue. Fever, exhaustion and swollen lymph nodes in the neck are common. It becomes dangerous if the inflammation spreads towards the neck, the floor of the mouth or the eye: lockjaw (the mouth can hardly be opened), difficulty swallowing, a swelling under the chin or tongue and breathing difficulties are emergency signs. First step: go to your dental practice or the out-of-hours dental service the same day; usually the abscess is opened and the tooth treated, often together with an antibiotic. After wisdom tooth surgery, on the other hand, swelling is normal and usually peaks after two to three days.

Sinuses and skin infections

With sinusitis, the cheek, forehead or the area around the eyes can swell slightly, along with pressure, a blocked nose and headaches when bending forward. Rarely, the inflammation spreads into the eye socket: the eyelid swells badly, the eye bulges, eye movements hurt or double vision develops — an emergency. Erysipelas shows up as a sharply defined, fiery, hot redness with swelling, often with fever and chills; the entry point can be a small crack at the nose or ear. Shingles on the face starts with burning pain and a one-sided swelling before the blisters appear. First step: with fever, hot redness or blisters, see a practice the same day.

Salivary glands: swelling when eating

If the area in front of the ear or under the jaw swells every time you eat and then slowly goes down, a salivary stone may be blocking the duct. An inflammation of the parotid gland (parotitis) causes a painful swelling in front of the ear, sometimes with fever — caused by bacteria, for example with a dry mouth and drinking too little, or by viruses such as mumps. In Sjögren's syndrome, the salivary glands can swell repeatedly. First step: an ENT (ear, nose and throat) practice; sour foods, massage and drinking plenty encourage the flow of saliva.

Fluid, kidneys, thyroid and cortisone

A slightly puffy face in the morning is often harmless: salty food, alcohol, too little sleep, lying flat or hormonal fluctuations during the menstrual cycle. New, persistent swelling, mainly around the eyes, can however point to a kidney disease with protein loss — typically with foamy urine, and often the legs swell too (see chronic kidney disease). A pronounced underactive thyroid causes a puffy, pale face with swollen eyelids, along with tiredness, feeling cold and weight gain. A round “moon face” during longer cortisone treatment is not swelling in the strict sense but a redistribution of fatty tissue. Rarely, the face and neck swell together, with distended neck veins and breathing difficulties — for example when a tumour in the chest narrows the superior vena cava; this needs to be checked promptly.

Self-tests: first clues at home

These observations do not replace a diagnosis. With breathing difficulties, trouble swallowing or circulatory problems, the rule is: no self-tests, call 112 immediately.

• The breathing and swallowing check first: can you breathe, speak and swallow normally? Is your voice unchanged? Does your tongue feel thick or your throat tight? Any change here is an emergency.
• One side or both: a one-sided swelling of the cheek or jaw points more towards a tooth, a salivary gland or an infection. Swelling on both sides, symmetrical, fits allergy, fluid or an internal cause better.
• Itching or not: itching and hives point to an allergic reaction. A firm swelling without itching and without hives, especially of the lips or tongue, suggests bradykinin-mediated angioedema instead.
• The finger pressure test: press gently on the swelling for a few seconds, for example on the cheek or over the shin. If a dent remains, that points to retained fluid. If the area is hard, hot and painful, it points more towards an inflammation.
• The timing check: when did it start, and what came before — a new medicine, food, a sting, hair dye, dental treatment, a cold? Does it swell when you eat, at the salivary gland? Note down the start and course, ideally with photos.
• The accompanying signs check: fever points to an infection, foamy urine and swollen legs to the kidneys, tiredness and feeling cold to the thyroid, recurring abdominal colic with swellings to hereditary angioedema.

Warning signs: when not to wait

• Swelling of the tongue, throat or lips with breathing difficulties, wheezing, hoarseness, a lump in the throat or trouble swallowing
• Facial swelling with hives on the body, dizziness, nausea, vomiting or circulatory problems after a food, a sting or a medicine
• Sudden swelling of the lips or tongue while taking an ACE inhibitor or sacubitril/valsartan
• Dental swelling with fever, lockjaw, difficulty swallowing or spreading towards the neck or eye
• Red, hot, sharply defined facial swelling with fever or chills
• Swelling around the eye with vision problems, double vision, a bulging eye or painful eye movements
• Swelling of the face and neck with distended neck veins and breathing difficulties
• Facial swelling after a head or face injury, especially with numbness or vision problems

The treatment pathway: step by step

1. Rule out an emergency. Breathing difficulties, trouble swallowing, tongue swelling or circulatory problems: call 112 immediately. Dental swelling with fever, hot redness or eye involvement: practice, out-of-hours service or emergency department the same day.
2. Stop the trigger and document it. Avoid the suspected food, cosmetics or hair dye, take photos, note down the start and course. If swelling of the lips or tongue has occurred, do not simply continue taking a new medicine on your own, but have it clarified by a doctor without delay.
3. Ease mild swelling. Cool it with an ice pack wrapped in a cloth and raise your head a little when sleeping. With itchy, allergic skin swelling and no warning signs, an antihistamine from the pharmacy can help.
4. Targeted assessment. GP practice for recurring or persistent swelling: urine, kidney values, thyroid values and, if necessary, complement factors such as C4 and the C1 inhibitor. Dental practice if a tooth is involved, ENT practice for salivary glands and sinuses, allergy specialists after allergic reactions — including issuing an allergy passport.
5. Treat the cause. Opening the abscess and treating the tooth, antibiotics for a bacterial infection, switching a triggering medicine, specific medicines for hereditary angioedema, treatment of the kidneys or thyroid.
6. Which treatment is right is always decided by the practice treating you — especially if a blood pressure medicine needs to be switched.

The medication angle: when active substances make the face swell

ACE inhibitors: the most common medication trigger

ACE inhibitors such as ramipril, enalapril or lisinopril are among the most frequently prescribed blood pressure medicines. They slow the breakdown of bradykinin and can therefore trigger angioedema — rarely, but because they are prescribed so often, it is not that unusual in practice. The swelling can appear for the first time in the first few weeks, but also after years of trouble-free use. According to the summary of product characteristics, no ACE inhibitor may be given again after such an angioedema; the practice then switches treatment to a different class of active substance. Angioedema has also been described with sartans, although less often. This matters for your medication plan: the trigger must be recorded there permanently as an intolerance.

Combinations that increase the risk

According to the summary of product characteristics, sacubitril/valsartan for heart failure must not be given together with an ACE inhibitor, and only 36 hours after its last dose, because otherwise the risk of angioedema increases. Gliptins for diabetes — the summaries of product characteristics of ACE inhibitors name vildagliptin as an example, and sitagliptin belongs to the same group —, mTOR inhibitors after organ transplantation and the diarrhoea medicine racecadotril can also increase the risk in combination with ACE inhibitors. The interaction check looks at such combinations.

Painkillers, antibiotics and contrast agents

In some people, aspirin (ASA) and other non-steroidal anti-inflammatory drugs such as ibuprofen or diclofenac trigger swelling of the eyelids and lips, often together with hives — an intolerance rather than a classic allergy. Antibiotics such as penicillins, iodine-containing contrast agents and many other active substances can cause genuine allergic reactions. How to recognise a drug allergy and what to do afterwards is explained in the guide Recognising drug allergies.

Cortisone and moon face

With longer use of cortisone such as prednisolone at higher doses, the face becomes rounder. This is a well-known side effect that usually reverses when the dose is lowered again. After longer use, however, you must not stop cortisone abruptly, because the adrenal glands need time to produce enough of their own cortisol again — more in the guide Stopping cortisone.

Painkillers for a swollen cheek

With a dental abscess, ibuprofen or paracetamol ease the pain until treatment, but do not replace it. Without medical advice, you should usually take over-the-counter painkillers for no longer than three to four days — and people who have previously reacted to painkillers with swelling should ask first. More in the painkiller comparison.

How to prevent facial swelling

• Document known triggers — record allergies and intolerances in your allergy passport and on your medication plan, and mention them with every new prescription.
• Carry your emergency kit — if you have ever had a severe allergic reaction, always carry your prescribed adrenaline auto-injector with you.
• Have your teeth checked regularly — treat decayed teeth and gum inflammation early, and do not mask toothache with painkillers for days.
• Test hair dye beforehand — do the allergy test described in the package leaflet before every dyeing, even with products you know.
• Less salt and alcohol in the evening — this can reduce morning swelling, as can enough sleep and a slightly raised head end of the bed.

Blood pressure medicines, allergies and intolerances in view — with brite

Medication plan, interaction check and health history in one place. Free of charge.

Start for free