Answer
Blackheads and whiteheads are types of acne caused by blocking sebaceous glands by sebum. The blackheads are black because they contain oxidized melanin, and the whiteheads are white because they are covered by a layer of skin that prevents oxidization.
A boil is caused by inflammation of the area surrounding a hair follicle.
A carbuncle is a group of boils that forms a connected area of infection under the skin.
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