These include hay fever , eczema , asthma , and many others. Food allergies and drug allergies are common. Allergic reactions can be caused by insect bites , jewelry, cosmetics, and almost any substance that contacts the body. Some people have allergic-type reactions to hot or cold temperatures, sunlight, or other physical stimuli . The mechanism that causes this is not well understood, but it is possible that minute changes in the chemistry of the skin may occur in response to physical stimuli and some component of this chemical change triggers the allergy.
Allergies are common.
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