Health Library Explorer
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A-Z Listings Contact Us
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Click a letter to see a list of conditions beginning with that letter.
Click 'Topic Index' to return to the index for the current topic.
Click 'Library Index' to return to the listing of all topics.

Skin Tests

What are skin tests?

Skin tests may be done to diagnose rashes, moles, skin allergies, food allergies, bacterial or fungal skin infections, and other diseases. Skin tests are also done to tell the difference between cancer (malignant) cells and noncancer (benign) growths.

What are the most common skin tests?

Allergy testing

Skin tests for allergies include:

  • Patch testing. Patch tests are used to help diagnose skin allergies leading to contact dermatitis. Small amounts of substances that may cause an allergic reaction (allergens) are applied to the skin. This is often done on the back using adhesive patches. These are left for a period of time, often 2 days. The skin is then checked for any reaction 2 to 4 days later.

  • Prick tests. Allergens are applied to the skin. The skin is pricked so the diluted allergen goes under the skin’s surface.

  • Intradermal tests. A small amount of diluted allergen is injected into the skin with a small, thin needle.

Skin biopsy

This test is used to diagnose skin cancer or skin disorders. A skin sample is removed and is checked under a microscope in a lab. Local anesthesia is injected to numb the area first. The sample may then be removed with a scalpel. For a shave biopsy, the skin sample may be removed with a razor blade. The sample is removed with a special tool (cylindrical punch) for a punch biopsy. 

Culture

Skin, hair, or nails may be cultured to figure out which bacteria, fungi, or viruses may be causing the problem.

Online Medical Reviewer: L Renee Watson MSN RN
Online Medical Reviewer: Michael Lehrer MD
Online Medical Reviewer: Rita Sather RN
Date Last Reviewed: 2/1/2019
© 2000-2019 The StayWell Company, LLC. 800 Township Line Road, Yardley, PA 19067. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
About StayWell | StayWell Disclaimer