Can a Food Allergy Cause Rashes on Your Buttocks & Inner Thighs?

A food allergy is a reaction of your immune system to a certain food. Food allergies can cause mild symptoms, but can also be life-threatening. A rash is one symptom of a food allergy, and if you have developed one on your buttocks and inner thighs, you might be wondering if you are allergic to something you have recently eaten. It is possible to develop a rash in these areas if you are allergic to a certain food. Once you know more, you can work with your doctor to get an accurate diagnosis and an effective treatment plan.

Many things can cause a rash on your buttocks and upper thighs.
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Food Allergy

A food allergy occurs when your immune system recognizes a certain food as dangerous. If you are allergic to a certain food, your body will produce antibodies and histamine when you consume it, which is what leads to symptoms. Any food can cause an allergic reaction, but the most common food allergens include eggs, nuts, milk, shellfish, wheat and soy. You will likely experience symptoms, including hives, wheezing and hoarse voice, within two hours after eating the offending food.


According to MedlinePlus, a website from the National Institutes of Health, a rash is a common symptom with a mild food allergy. When you have an allergic reaction to a specific food, your blood vessels might dilate, which causes a rash. You might develop contact dermatitis around your mouth when you come into contact with a certain food, or you might develop a rash elsewhere on your body.

Alternate Causes

It is possible to develop a rash on your thighs and buttocks because of a food allergy, though it is not as likely as a rash on your face or neck. The rash on your buttocks and inner thighs might be due to another cause, however. Atopic dermatitis, also called eczema, is a rash that occurs, or gets worse, when you come into contact with certain substances, though it is not considered a true allergy. Common culprits that can cause atopic dermatitis include animals, pollen, dry skin, stress, fragrances in soap or long-term exposure to water. Heat rash might also cause a rash on your buttocks and inner thighs. Heat rash occurs when your sweat ducts become blocked, which can occur if you get too hot, when you wear certain fabrics or when you use heavy ointments.


If you suspect that the rash on your buttocks and inner thighs is because of a certain food, make an appointment with your doctor. He can run a series of tests to determine whether you are truly allergic to the food. If you have more serious symptoms, such as difficulty breathing, in combination with your rash, seek medical attention immediately. If your rash does not get better, or gets worse, within one or two days, you should also see your doctor to determine the cause.

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