The skin prick test is a diagnostic method for the quantitative detection of allergies (immediate response). It can be applied as droplets to the skin of the forearm using standardized allergen solutions as well as a positive and a negative sample. Then the allergen solution is carefully brought into the top layer of the skin with a small needle. After 20 minutes, the test is compared to the controls for evaluation. During the test, reddening of the skin and an itching sensation may occur.