What is the term for a boil or abscess of the skin located in the hair follicle?

The term for a boil or abscess of the skin located in the hair follicle is known as a furuncle. A furuncle, commonly referred to as a boil, results from infection of the hair follicle, typically caused by bacteria such as Staphylococcus aureus. This condition is characterized by a painful, pus-filled bump that can develop at the site of the hair follicle.

Understanding the other terms helps clarify why furuncle is the correct response. Athlete's foot refers to a fungal infection affecting the skin of the feet, not related to hair follicles. Acne is a skin condition that involves clogged hair follicles but is primarily characterized by pimples and other blemishes rather than the formation of large abscesses. Psoriasis is a chronic autoimmune skin condition that results in the rapid growth of skin cells, leading to scaly patches and is not directly related to hair follicles or abscess formation.

Thus, the definition and characteristics of a furuncle make it the precise term for the scenario described in the question.