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Why do demodex mites like human skin?

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This question was asked and I am sharing my answer here as well.
 
Basically everyone has demodex mites and it has been thought that the mites have some sort of undisclosed symbiotic relationship, i.e., the mites eat sebum which helps the mites and helps the humans keep sebum stasis. One report states, "....Demodex mites were originally perceived to be commensals, having a symbiotic relationship with the human host." - See Jarmuda et al published in the Journal of Medical Microbiology (second article mentioned in this post). While this same report says that 'most human populations' have NOT been sampled for demodex mites the general belief is that demodex are common throughout humanity and pose no problem as a pathogen except in the case of demodectic rosacea as far as known. 
 
A Russian study on the mites says, "Demodex folliculorum shows signs of parasitism, while Demodex folliculorum brevis is a saprophyte."  It is comparable to bacteria which humans have a relationship with, there is good bacteria and bad bacteria. The probiotic bacteria and the pathogen bacteria. The demodex mites usually pose no problem with the vast majority of humans since they are possibly on everyone. Why they become more numerous seems to be of more importance. 
 
For some unknown reason the mites are in higher density in rosacea patients. We don't know if the rosacea cause this increase in mites or does the increase in mites cause the rosacea, the old chicken or egg conundrum? There is evidence that reducing the mite density count improves rosacea.  It is clear that the mites like human skin since they eat sebum.  
 
Maybe the increase of sugar/carbohydrate in the diet increases sebum which in turn increases the mite population, and voila, the inflammation of rosacea
 
I don't think all rosacea is demodectic. GUT Rosacea is a different variant, but may be connected or associated.  The list of systemic comorbidities with rosacea keeps growing. The gut microbiome is obviously connected with skin microbiome (see my post on this).  

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