One of the most common medical procedures today is the skin test by means of which doctors tell whether a person is sensitive to ragweed, strawberries, horsehair, chicken feathers, scarlet fever, diphtheria or any other known allergen. The physician scrapes off a tiny area of the patient's skin, applies a drop or two of the allergic substance, covers the whole with a piece of adhesive plaster. Skin tests have preserved the health and lives of multitudes. They have also" served to reveal that about 1% of the population develops an eczema-like skin irritation...
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