Certain foods, including shellfish, nuts, cow milk, eggs, soy, wheat, fish, sesame seeds, and food additives, can trigger skin reactions. This immune response leads to symptoms like hives, itching, eczema, and contact dermatitis. Artificial colors, flavors, and preservatives can also play a role.Certain foods, including shellfish, nuts, cow milk, eggs, soy, wheat, fish, sesame seeds, and food additives, can trigger skin reactions. This immune response leads to symptoms like hives, itching, eczema, and contact dermatitis. Artificial colors, flavors, and preservatives can also play a role.