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| | AllRefer Health - Allergies |
 | | When an allergen enters the body of a person with a sensitized immune system, histamine and other chemicals are released by certain cells. |
 | | Common allergens include those that contact the skin, breathing passages, or the surface of the eye (such as pollen; see also allergy to mold, dander, dust). |
 | | Allergic reactions can be caused by insect bites, jewelry, cosmetics, and almost any substance that contacts the body. |
| health.allrefer.com /health/allergies-info.html (530 words) |
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