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Lip Swelling: Causes and Why It’s Not Always an Allergy

by | Sep 11, 2025 | Allergy

Lip Swelling: Causes and Why It’s Not Always an Allergy

From Keystone Allergy and Asthma Center – Exton, PA

Waking up with swollen lips or experiencing sudden swelling during the day can be alarming. Many people immediately think of a food allergy or insect sting, but there are actually several different causes of lip swelling. At Keystone Allergy and Asthma Center in Exton, PA, we help patients of all ages in Chester County identify the true reason behind these symptoms and create the right treatment plan.

Common Causes of Lip Swelling

1. Allergic Reactions

  • Food allergies (nuts, shellfish, dairy, etc.)

  • Medication reactions

  • Insect bites/stings
    Allergies often cause sudden swelling, sometimes with itching, hives, or difficulty breathing. This can be serious and requires urgent care.

2. Angioedema (Non-Allergic)

  • Can mimic an allergic reaction but is sometimes related to genetics or medications (like certain blood pressure drugs).

  • May occur without hives and often recurs unexpectedly.

3. Infections

  • Cold sores (herpes simplex virus)

  • Skin infections or dental infections near the lip area
    These usually cause localized swelling with pain, redness, or blisters.

4. Injuries or Irritation

  • Biting the lip

  • Dental procedures

  • Cosmetic fillers or trauma
    These typically cause swelling in one area only.

5. Medical Conditions

  • Autoimmune conditions

  • Nutrient deficiencies

  • Rare inflammatory syndromes

When to See an Allergist or Doctor

You should seek medical care if lip swelling is:

  • Sudden and severe (especially with trouble breathing or swallowing)

  • Recurring without a clear trigger

  • Accompanied by hives, rashes, or wheezing

  • Persistent despite home care

At Keystone Allergy and Asthma Center in Exton, our board-certified allergists can help determine if swelling is allergy-related, medication-induced, or due to another cause.

Local Support for Lip Swelling and Allergy Care in Chester County

Keystone Allergy and Asthma Center proudly serves families across Exton, Downingtown, West Chester, Malvern, and all of Chester County, PA. We provide:

  • Comprehensive allergy testing

  • Angioedema evaluation

  • Asthma and food allergy management

  • Personalized treatment plans for adults and children

Take the Next Step

If you or your child experience unexplained lip swelling, don’t assume it’s “just an allergy.” Schedule an evaluation at Keystone Allergy and Asthma Center in Exton, PA to get answers and the right care.

📞 Call or Text us to book your appointment at 484-897-7143
📍 Conveniently located in Exton, serving patients throughout Chester County.