According to cosmetic dermatologist Sam Bunting, pores are the visible end of a flimsy funnel – otherwise known as the sebaceous gland duct – that transports sebum, an oily substance that helps keep the skin and hair moisturised, to the skin’s surface and is held in its upright position by the “scaffolding” protein collagen.

皮肤科医生萨姆·邦廷说，毛孔是一种可见的脆弱的漏斗状物，也被称为传输皮脂的皮脂腺管，皮脂这种油性物质有助于保持皮肤和头发湿润，它存在于皮肤表层，由支架蛋白垂直支撑。

While pores don't open and close as some people suggest, there are a number of reasons they become more visible over time.

虽然毛孔不像某些人所说的那样会打开和关闭，但随着时间的推移，有很多原因会使得它们变得越来越明显。

“Firstly, increased transit of sebum through the funnel makes the pore more visible – this happens at puberty, due to the change in sex hormones, and it happens as we get older, when ageing and UV damage mean collagen breaks down, allowing the pore to flop open more,” Bunting tells The Independent.

“首先，通过毛孔传输的皮脂越多会让毛孔更明显，这发生在青春期要归因于性激素的变化，随着年龄的增长毛孔也越来越明显，老化和紫外线损伤意味着胶原蛋白分解，毛孔也就越来越多，”邦廷告诉《独立报》。

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