Where does dandruff come room and why can’t it appear all over our body, why only the head?
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Dandruff can appear anywhere, but it’s most prominent on the head because oil is produced by hair follicles and this is where you have the greatest number and density of them.
Basically, your skin is a bunch of layers of cells held together by a mesh of something called keratin. The bottom layer of your skin is constantly making new layers, while the top layers are constantly falling off. Normally, they fall off as extremely small pieces you don’t notice until they build up in your house as dust.
If you have dandruff, what’s probably going on is that the fungus that lives on your skin is a messy eater. Normally, this fungus digests the oils your skin produces, excreting harmless byproducts. However, if you have dandruff, something about the relationship between your oils and your fungus means that the fungus doesn’t digest the oil properly, it instead produces high levels of something called oleic acid. This can be because of genetic conditions causing you to produce too much oil or making your oil harder to digest, or it could be because your fungus needs to man up and do its job properly. In any case, the oleic acid irritates your skin, causing inflammation and causing the keratin to not break up as much before skin falls off, so instead of a fine dust it’s coming off as larger flakes.
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