Which type of allergy test, also called a subcutaneous test, introduces dilute solutions of allergens into the skin of the inner forearm or upper back with a fine-gauge needle?

The type of allergy test is scratch test.

Explanation:

In a scratch test also called a skin pri c k test or puncture test, an allergy provoking substance placed on the skin is gradually scratched  into the skin surface with the aid of a needle or lancet so as to detect bodily reactions to allergens. Some of the types allergens whose reactions are generally tested for include pollen, dust mites, molds and foods.

The scratch test takes about 5 to 10 minutes and it could cause slight pain and the may  result in itching feeling at the location where the allergen was introduced.