What should you know about top lip swollen for no reason?

Lip swelling may follow a new food, medicine, cosmetic, toothpaste or lip product, even when the trigger is not obvious. Local irritation, an insect bite, a minor injury, a cold sore or a dental problem can affect one area. Deeper swelling without a clear rash may be angioedema, which can involve the lips, eyelids, tongue or throat. Swelling can also occur with infection, especially when pain, warmth, pus or fever is present.

The symptom alone cannot identify its cause. Note when it began, whether one or both lips are affected, what touched the area, and whether you started a medicine or ate something unfamiliar. Take a photograph if the appearance changes while you arrange advice.

Stop using a new lip or facial product and avoid suspected triggers until a clinician advises you. Do not pierce, squeeze or apply strong creams to the swelling. A cool compress may ease discomfort if the skin is intact. Contact a healthcare professional for persistent, recurrent, painful or unexplained swelling, and mention medicines such as blood-pressure treatments that can cause delayed reactions. Read about Angioedema for related information.

Call emergency services immediately if swelling affects the tongue or throat, breathing, swallowing or speaking, or if you feel faint or develop widespread hives. Urgent same-day assessment is also appropriate for rapidly increasing swelling, severe pain, fever, spreading redness or pus. Do not drive yourself if breathing is becoming difficult.

Tell the clinician when the swelling started, what you ate or applied beforehand, every medicine and supplement you use, whether this happened before, and whether there was itching, hives, pain, fever, dental symptoms or breathing change.