What are the safety precautions for patch testing?

May 08, 2025 Source: Cainiu Health

Dr. Liu Wenmin

Introduction

Under normal circumstances, patch testing is a method used to detect whether the skin is allergic to specific substances. When undergoing patch testing, it is important to communicate detailed medical history with the physician, avoid direct exposure to ultraviolet light, keep the skin dry and clean, avoid scratching the test site, and remove the patch according to medical instructions. If any discomfort or allergic reaction occurs, it should be reported to the physician immediately.

Generally, patch testing is a method used to detect whether the skin is allergic to specific substances. When undergoing patch testing, attention should be paid to several aspects, including detailed communication with the physician regarding medical history, avoiding direct ultraviolet radiation, keeping the skin dry and clean, refraining from scratching the test area, and removing the patch on time as instructed by the physician. A detailed explanation is as follows:

1. Detailed Communication with the Physician Regarding Medical History

Prior to undergoing patch testing, the subject should communicate detailed personal allergy history, dermatological history, and other relevant medical history with the physician. This helps the physician determine whether the subject is suitable for patch testing and which substances should be selected for testing.

2. Avoid Direct Exposure to Ultraviolet Radiation

During the testing period, subjects should avoid prolonged exposure to sunlight or other heat sources. Ultraviolet radiation may intensify the skin's reaction to the test substances, leading to inaccurate test results. Therefore, subjects should minimize outdoor activities during the testing period or take effective sun protection measures when outdoors.

3. Keep the Skin Dry and Clean

The test area should remain dry and clean during the testing period. Avoid washing the test area with hot water, soap, detergent, or other irritating substances, as this may interfere with the test results or trigger skin inflammation. Additionally, subjects should refrain from applying any cosmetics or medications to the test site to avoid affecting the accuracy of the test.

4. Avoid Scratching the Test Area

During the testing period, subjects should avoid scratching or rubbing the test area. Scratching or rubbing may cause skin damage, leading to infection or exacerbating allergic reactions. If itching or discomfort occurs at the test site, the subject should promptly inform the physician so that appropriate measures can be taken.

5. Remove the Patch on Time as Instructed by the Physician

The patch should be removed within the specified time. Subjects should follow medical instructions to remove the patch on schedule and observe the reaction at the test site carefully. If severe pain, burning sensation, or other discomfort occurs at the test site, the subject should immediately remove the patch and inform the physician for appropriate management.

During patch testing, subjects should closely monitor their physical condition. If any discomfort or allergic reaction occurs, they should immediately inform the physician.

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How to Determine True and False Positive Results in Patch Testing

Under normal circumstances, determining the authenticity of a positive patch test result requires comprehensive consideration of multiple factors, including the timing of the reaction, the morphological characteristics of the reaction, the assessment of reaction severity, verification through repeat testing, and evaluation in conjunction with the patient's medical history. In daily life, known allergens should be avoided as much as possible to reduce the occurrence of allergic reactions.

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Can patch testing be performed during the acute phase of dermatitis?

During the acute phase of dermatitis, patch testing is generally not recommended because the skin is in a state of high sensitivity and may produce an inflammatory reaction. Performing patch testing at this time could exacerbate symptoms, compromise the accuracy of results, and pose safety concerns. Additionally, to ensure accuracy, medications such as corticosteroids and antiallergic agents should be discontinued before undergoing patch testing.

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What are the precautions for using Kushen gel?

In general, Kushen gel, as a topical traditional Chinese medicine, is mainly used for the treatment of gynecological inflammation. During use, it is important to follow standardized application and safety precautions. Key points include clearly understanding the indications, using the medication properly, observing contraindications during menstruation, watching for allergic reactions, and maintaining appropriate daily care. The medication should be stored in a cool, dry place away from direct sunlight.