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With the separation of contact dermatitis from specific eczema (neurodermite), it has become increasingly more important to test properly substances that produce lesions on contact with the skin. In making contact tests, the substance is left in contact with the skin for a period of twenty-four hours or longer.
The simplest device used is a square of adhesive plaster holding the substance against the skin. Cellophane has also been used, held down to the skin by adhesive plaster or collodion.
The device described here offers these advantages :
1. Visibility. The reaction, if any, is seen at all times. This is important, as it is desirable to limit the amount of reaction. The patient is instructed to remove the substance from the skin as soon as any reaction is seen.
2. Protection against irritation from clothes and against injury.
3. Aeration. It prevents maceration of skin from accumulated perspiration.
Brown A. VISIBLE CONTACT TESTER. JAMA. 1937;108(10):802–803. doi:10.1001/jama.1937.92780100001012
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