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What is the difference between demodex, dust mites and bed bugs?

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There is a difference between demodex, dust mites and bed bugs. So what are the differences? 

Demodex Image courtesy of Wikipedia - adult, D. folliculorum can measure 0.1 mm to 0.4 mm in length and possess four pairs of short legs near its head and neck region, so they are are barely seen with naked eye. 


Dust mite image courtesy of Wikipedia - Dermatophagoides farinae measures 0.2–0.3 mm (0.008–0.012 in) in length

Bed Bug Image courtesy of Wikipedia - Adults grow to 4–5 mm (0.16–0.20 in) long and 1.5–3 mm (0.059–0.118 in) wide, so they can be seen with the naked eye. 

So the demodex is the tiniest, which you can barely see with the naked eye, about the size of a grain of salt (a microscope or dermoscopy facilitates an investigation better than the naked eye). The dust mite you can barely see with your naked eye and is a little bigger. The bed bug you can see with your naked eye and is the largest.  

So you should differentiate whether you are suffering from either demodex, dust mites or bed bugs. A dermatologist can determine if you are suffering from either one or all three. All mite afflictions are treatable and respond well to treatment. 

In this forum rashes from bed bugs or dust mites are rarely mentioned. However, many have reported success treating demodectic rosacea with Soolantra, the ZZ cream and a number of other treatments. There is an article discussing dust mites and atopic dermatitis [1].

End Notes

[1] Vitamin D, Dust Mites, and Atopic Dermatitis
Korean study suggests a connection, Medpage Today


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