|mold mite (drawing)|
There are a couple of things that people describe this way but in my experience mold mites (mould mites), also called grain mites, are the most common.
These tiny mites feed on mold that grows on damp surfaces so are almost always associated with excess moisture and mold growth in one way or another. Their presence in kitchens can indicate a leaky pipe or dishwasher.
The mites don't bite or cause any harm but some people will experience an allergic reaction to large numbers of mites similar to dust mite allergy. In fact mold mites are related to dust mites. This allergic reaction can be as simple as a stuffy noise or an itchy rash or even difficulty breathing.
The only treatment that is needed is to control the sources of moisture. Once the area dries out the mites and mold will go away. After all sources of moisture are eliminated the area can be treated with a botanical insecticide like EcoPCO-ARX to control remaining mites.
See the 'Bugs Website for information about other insect and mite pests.