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The nervous system senses the stress the body is undergoing and causes an increased production of cortisol along with other hormones. These stimulate the sebaceous glands to release more oil, causing rashes due to the irritation of the skin.
Rash Symptoms. The most common rashes associated with a coffee allergy are hives, general itching and eczema, according to Food Allergy Research and Education. Hives are welts that form in various shapes and sizes and are extremely itchy. The welts have defined borders that can migrate to anywhere on your body, according to MedlinePlus.