Grass mites are especially active during the warm, dry summer months, typically found in meadows, gardens, and areas with tall grass. While adult mites do not cause problems for humans, their larvae can trigger unpleasant skin reactions. These larvae attach themselves to the skin of people or animals, causing distinctive red spots and itching
According to Lieke Mevis from the nature and environmental organisation Natur&Ëmwelt, grass mite larvae do not bite or sting. Instead, they cling to the skin and release enzymes in their saliva, which break down the skin’s surface so they can feed. Although these reactions are, in most cases, harmless, the resulting itching and small red dots can be very uncomfortable, and those with sensitive skin may experience larger, inflamed patches.
Grass mites are a natural part of the ecosystem. Their larvae live for a short time as parasites, while adult mites feed on small soil organisms. For humans, however, their presence tends to be a seasonal nuisance. The level of grass mite activity largely depends on weather conditions: mild winters allow more mites to survive, and long, warm, dry spells, like the one Luxembourg experienced recently, encourage their proliferation. Now that rainfall has returned, activity may subside for a while, but outbreaks can still happen later in the season.
The itching often begins several hours after exposure to affected grass. The most commonly affected areas are the legs, ankles, or anywhere clothing fits snugly against the body. Dr Nico Haas advises that mild discomfort can sometimes be eased by applying diluted vinegar to the skin. However, if symptoms persist, it is best to seek relief with an antihistamine or a hydrocortisone cream. He warns not to scratch, as bacteria living on the skin can enter through broken skin and lead to infection, which may cause the affected area to become larger, redder, and more painful. In such cases, a doctor should be consulted.
To reduce the risk of mite contact, it is recommended to wear long trousers and closed shoes when walking through tall grass. After spending time outdoors or gardening, showering and changing clothes can help remove any mites on the body. With a few simple precautions, encounters with these tiny but troublesome creatures can be minimised.
