Contents:
- Medical Video: Uncovering skin allergies with patch testing
- Patch test
- Skin biopsy
- Shave biopsy
- Punch biopsy
- Excisional biopsy
Medical Video: Uncovering skin allergies with patch testing
Contact dermatitis is a condition in which the skin reacts to allergens or irritants with the appearance of a rash. Tests are usually not needed to diagnose this condition. Contact dermatitis can be diagnosed with clinical observation and medical and social history. However, in certain cases, tests may be needed.
Patch test
Patch tests can be used to diagnose allergic contact dermatitis by determining the allergens that cause the reaction. It usually takes 5 to 7 days for patch tests.
The doctor will apply a small amount of different allergens to the patient's back and cover with an airtight dressing, or use aluminum that is attached to the back. In both methods, the patch will be released after 2 days, then installed and released again after 5 to 7 days. The reaction that occurs will indicate an allergen. Reactions can include rashes, lumps or blisters. If the reaction disappears after the allergen is released, the test results are likely to be positive.
Bringing ingredients that are thought to cause allergies when you consult a doctor can speed up the process of this test. Ask your doctor if you have to bring something at a meeting with a doctor.
Skin biopsy
Skin biopsies are not usually performed to diagnose contact dermatitis, but are used to eliminate other possibilities suspected by the doctor, such as fungal infections. Severe and repeated cases of contact dermatitis can make the doctor perform a skin biopsy, where skin samples will be taken and tested in the laboratory.
If you have a wound, the doctor can use a sample from the affected area of the skin. Samples are usually taken in the following ways.
Shave biopsy
This type of biopsy is the least invasive. The doctor will remove the skin from the outermost layer. No need for stitches.
Punch biopsy
The doctor will take a sample the size of a pencil eraser using a sharp and hollow tool. Sutures can be needed, depending on the sample size.
Excisional biopsy
This type is most rarely done. In this procedure, the doctor removes all parts of the wound with surgery and closes with sutures. For large parts, removal of the skin can be needed.
Usually, you don't need a test to diagnose contact dermatitis. Doctors can identify with a medical history and examination of the rash and surrounding area. The test is only used to make sure there is nothing other than contact dermatitis, or to identify allergens. Consult with your doctor if a test is needed and the most appropriate choice is made.
Hello Health Group does not provide medical advice, diagnosis or treatment.
