Skin Tests

What are skin tests?

Skin tests may be performed to diagnose skin allergies, food allergies, bacterial or fungal skin infections, and other diseases. Skin tests are also performed to differentiate between malignant (cancerous) cells and benign (non-cancerous) growths.

What are the most common skin tests?

  • Patch testing. Patch tests are used to help diagnose skin allergies. Identified allergens are applied to the skin with adhesive patches and left for a period of time. The skin is then examined for any reaction.
  • Prick tests and intradermal tests are used to screen for food or environmental allergens. Allergens are applied to the skin or just under the skin with a needle.  Tested area is then evaluated for reaction (redness, swelling or itch).
  • Skin biopsy. A skin biopsy is the removal of skin for laboratory analysis. The sample of skin may be removed with a scalpel or a cylindrical punch, after numbing the area with a  local anesthesia. Skin biopsies are performed to diagnose skin cancer or benign skin disorders.
  • Culture. Skin, hair, or nails may be cultured to detect bacteria, fungi, or viruses.