Orofacial granulomatosis is a rare skin condition that causes swelling in the face, mouth, or lips. The cause is often unknown, but experts think it’s related to allergies or an immune reaction.

Ingredients in some vitamin supplements may cause hives or a skin rash. Treatments include antihistamines and topical corticosteroids.

Teigen believes there may have been pesticides or some other substance on the orange peel that caused the reaction. Chrissy Teigen says her swollen lips were caused by an allergic reaction after ...

Some food allergies can cause mouth sores. Examples include allergies to apples, bananas, carrots, and some nuts. Food allergies can trigger conditions such as oral allergy syndrome (OAS) and allergic ...