1A plug of sebum in a hair follicle, darkened by oxidation.
- These pimples vary according to the severity of the acne and range from whiteheads, blackheads, pustules and nodules to cysts.
- Like benzoyl peroxide, sulfur keeps bacteria in check and works wonders on whiteheads, blackheads and pimples.
- Acne is the blanket term used for skin irritations, including blackheads, whiteheads, pimples, and the deeper cysts that may form on your shoulders, neck, face or other areas.
2 [mass noun] An infectious disease of turkeys producing discoloration of the head, caused by a protozoon.
- Turkey farmers in the UK are in a panic over blackhead disease, fearing an outbreak among their flocks after the drug they used to rely on was banned.
- Turkeys at two Dutch farms were diagnosed with parasite-borne blackhead, but the government was not very concerned because about 10 cases of the disease are reported each year.
- Ten million turkeys being reared for the festive period are at risk from blackhead, a parasitic liver disease which causes birds to waste away.
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