A/An ________ or prick test involves the placement of a suspected allergen in the uppermost layers of the epidermis.

Allergen

A substance that triggers an allergic reaction in susceptible individuals.

Epidermis

The outermost layer of skin, providing a waterproof barrier and creating skin tone.

Prick Test

A diagnostic method where a small drop of allergen is prick-applied to the skin to check for allergic reactions.