Acarids are classed as arachnids (which makes them related to spiders). Some of them are responsible for causing allergies. These are known as dust mites. They cannot be seen with the naked eye as they measure less than one millimetre (they are between 0.1 and 0.3 mm). Dust mites are cosmopolitan: they live in mattresses, pillows, carpets, duvets, bed settees, sofas, padded furniture, soft toys, etc. They nourish themselves with skin shed of people and animals as well as organic waste of all kind (e.g. food waste). Dust mites like places that are dark, warm and humid.
Mattresses are their preferred habitat as this puts them close to their favourite source of food and moisture (the human body!), but also because it is a safe environment, that is dark and difficult to reach when harmful products would be used such as biocides.
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Dust mites do not bite or puncture the skin in any way. Among allergic or hypersensitive people however, they can trigger symptoms such as rhinitis (nasal congestion, runny nose, etc.), asthmatic reactions or dermatitis (eczema). The allergens that are causing those symptomatic reactions are the excrements and exuviae (the skin left behind after moulting). The allergens spread easily through the air and enter the lungs and can cause allergic reactions. Clinical research has shown that allergic symptoms increase when the number of allergens present in their environment increase.