They are usually the most irritating line of defense and the body's reaction to a potential contaminant.
For example, when one touches poison ivy, the body will release histamines to react to the allergen. A blotchy red patch will appear on the skin (possibly several). An anti-histamine, like Benadryl, can help clam these symptoms.
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At my high school we have more than twice the amount of kids should so getting lunch in the first place is hard to do. But, on the other hand, I am influenced by my peers if they make up there mind. Like if they get a salad, I probably will too to not lose them in the line to get the food and it might be faster.
Two locations would be the forehead and ear.
