Facial rashes that develop after you eat are typically a symptom of a food allergy. A food allergy causes an immune system reaction shortly after you eat a food that your body mistakes as a dangerous substance. You may develop a rash initially in one part of the face, such as around the mouth, that may spread to other parts of your body. The most common rashes associated with an allergic reaction are hives and eczema.
Food Allergies
Food allergies occur when your immune system doesn't recognize a particular protein in foods as safe for consumption. Soy, eggs, fish, tree nuts, peanuts and milk are the most common foods that cause allergic reactions in some people. After you eat foods that trigger this reaction, mast cells produce histamine. Histamine protects the body from infectious disease, but during an allergic reaction it causes irritation and swelling in soft tissue. Increased histamine in the skin is what causes your face to break out in a rash.
Facial Rashes
A face rash that is related to an allergic reaction to food will develop within minutes after you eat. Hives is the most common rash that will form because it can develop in anyone, whereas eczema only forms if you're predisposed to the skin condition. Hives appear as raised red welts that are extremely itchy and typically migrate from one area of the face to another. Hives can appear in various shapes and sizes, but always have defined borders. Eczema is a long-term skin condition that can be triggered by a food allergy, causing itchy blisters to form on your face.
Facial Swelling Concern
If you notice facial swelling along with hives, you should call 911 immediately. Facial swelling along with hives is a sign of a severe allergic reaction. Anaphylaxis is a whole-body allergic reaction that can restrict your breathing and cause your body to enter a state of shock. This condition is potentially deadly and needs medical intervention. If you develop anaphylactic shock, you will need an injection of epinephrine to treat the symptoms. Other signs of anaphylaxis include diarrhea, lightheadedness, severe stomach pain, a faint heart rate and a drop in blood pressure.
Treatment
Facial rashes that are caused by a food allergy are treated through prevention and treating the rash. Prevent facial rashes from food allergies by receiving a diagnosis of which foods you're allergic to. Avoid eating the foods that trigger an allergic reaction. Apply a steroid-based cream or lotion to the rash on your face to reduce the swelling and itching.
