In this case, skin inflammation is considered to be a common cause of allergies. There are many factors that cause allergies, including food (shrimps, crabs, strawberries, nuts, milk, peanuts, eggs, etc.), drugs (biological products, antibiotics, vaccines, blood products, etc.), inhalants (pollen, feathers, dust mites, animal dander, etc.), and physical factors (heat and cold, sunlight, friction, etc.).