0 a very small, dark spot on the skin caused by a blocked pore (= small hole in the skin's surface) -- 黑頭粉刺
The nematode causes a disease condition called toppling or blackhead disease in plants.
It is a form of blackhead disease in poultry.
Oily skin is usually prone to blackheads, whiteheads, spots and pimples.
Oxidation rather than poor hygiene or dirt causes blackheads to be black.
A comedo may be open to the air (blackhead) or closed by skin (whitehead).
They are often confused with blackheads, a type of comedo.
A comedo can be open (blackhead) or closed by skin (whitehead), and occur with or without acne.
For this reason, those who frequently erupt with whiteheads or blackheads are advised to avoid topical use of this substance on the skin.
