So, what is the mud in the belly button?
The navel is a special skin tissue with a special morphology and a special skin appendage, the apocrine sweat gland (also called apocrine sweat gland).
The secretion of the apocrine sweat glands, along with the keratin exfoliated by the skin, urea from the sweat secreted by the eccrine glands, and dirt from the outside world, are all collected in the navel.
Moreover, most people's navel is sunken, which is a good place to hide dirt and dirt, and bacteria will also multiply and ferment in it. If not cleaned in time, these dirt will accumulate locally, and over time, "mud" will slowly accumulate.
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