• Wednesday July 15,2020

Mites bite

A walk in the woods, the picking of flowers in a meadow or working in the garden, all this can be enough for a grass mite bite. The changing climate in recent decades and the wrong behavior during walks make it easy for parasites to find victims. In search of protein-rich food, they bite humans and animals.

What is a grass mite bite?

Redness occurs a few hours after the grass mite bite, so it is often mistaken for mosquito bites. A typical symptom is the intense itching. The increased scratching often leads to inflammation.
© somchairakin - stock.adobe.com

The arachnids live in the ground, where they lay their eggs and the larvae hatch in the summer. Not the adult grass mites but the orange-red larvae are responsible for the stings. In warm weather, the approximately 0.3 millimeters larvae come to the surface. The mites and larvae are very small and not visible to the naked eye.

They collect in bright and slightly damp places, for example on meadows and in gardens. For their further development, the larvae need humans and animals as hosts. The grass mite bite primarily affects the ankles, knees, loins and armpits. The larvae have a biting tool to penetrate the skin. In the grass mite bite, an enzyme contained in the animals' saliva enters the wound and dissolves the uppermost layer of the skin.

This leads to nodules and wheals, which sometimes occur only hours after the grass mite bite. The itching, which is also triggered, can become even more intense three days later and last up to two weeks. The affected person does not notice the grass mite bite itself, as the mouthparts penetrate only fractions of a millimeter. The animals feed on the lymph fluid and on the cell sap, not on blood.


The grass mites, also known as autumn, autumn grass and harvest mites, sneak up on their legs to their victims, who are warm-blooded humans and animals. The larvae perch in colonies on grass stalks, in the bushes or on the ground. When a creature passes by and has optimal operating temperatures of about 30 to 40 degrees Celsius, the larvae settle on the host.

They usually get on their feet, from which they walk up their legs and bite into suitable places. There, the grass mite bite leads to an unbearable itch. The larvae like to find pleasant places that include warm and humid areas, such as the edges of socks, the waistband, underwear, armpits.

If the larvae have eaten to about three times the size of the grass mite bite, they will fall. In the next four to six weeks they will turn into a nymph.

Symptoms, complaints & signs

Redness occurs a few hours after the grass mite bite, so it is often mistaken for mosquito bites. A typical symptom is the intense itching. The increased scratching often leads to inflammation.

Therefore, it is important not to scratch the wheals. The bite site can be disinfected with a cotton swab soaked in alcohol. Soothing ointments help against the itching. The itching can last for up to 14 days, but is most pronounced in the first three days. The grass mite bite develops into reddish, usually slightly swollen pustules containing small water bubbles.


Those who discover numerous bites on the body after their stay outdoors, some 200 bites and in rows next to each other, as well as suffering from a severe itching, was probably bitten by grass mites. Here, it is important to note the places mentioned, which select grass mites predominantly.

A special treatment is not necessary, as it is the case with fleas and lice, because the larvae do not stay very long on the skin, but disappear after a few hours. The symptoms are uncomfortable, but the mite itself is harmless. It does not suck blood, does not transmit disease and, in addition, no human-to-human transmission is possible.


As a rule, the grass mite bite causes various infections and inflammations in the patient's body. The affected areas are reddened and affected by itching. The itching will continue to increase as the patient scratches the affected area. In most cases, the itching will continue for two weeks after the bite and can lead to unpleasant feelings.

However, there are no further complications or complaints. On the third day after the bite the symptoms are strongest and can therefore reduce the patient's quality of life. The grass mite bite is not treated by a doctor and also does not lead to a reduced life expectancy. After the symptoms have resolved and the itching no further complications.

The affected person can treat the grass mite bite with simple home remedies and thereby limit the pain and the itching. If there is an unbearable itchiness or infection, treatment may be by antibiotics or by creams and ointments. The treatment of the grass mite bite always leads to a positive disease course.

When should you go to the doctor?

In the case of a grass mite bite, a doctor usually does not need to be consulted. By using insect repellents, which are repeatedly applied after a bite or bite on the affected area, can significantly alleviate the symptoms. The drugs can be purchased over-the-counter in pharmacies and drugstores.

If no further complications occur, the bite site heals completely within a few weeks and the patient is symptom-free. A visit to a doctor is necessary as soon as it comes to inflammation of the entry point. Through the open wounds, pathogens can invade the organism and lead to other diseases.

Therefore, a doctor should be consulted as soon as it comes to pus formation, fever or enlargement of the wound. If the itching of the grass mite bite leads to severe problems in everyday life or psychic abnormalities, a doctor should be asked for help. If allergic reactions occur, it is also advisable to consult a physician.

If it comes to severe swelling at the bite, fever, sweating or redness spread unusually wide, a doctor should be consulted. For people who have problems with locomotion due to the grass mite bite, a doctor's visit is needed immediately. In case of numbness, severe sensory disturbances, gait insecurity or pain, a doctor must be consulted.

Treatment & Therapy

The skin changes caused by the grass mite bite can be locally treated with an alcohol cover or an antipruritic ointment for disinfection. Dabbing with vinegar or lemon juice is also possible. Saltwater is also a proven remedy. Envelopes with quark from the fridge can also reduce the itching to a tolerable level.

In addition, there are tablets containing the active ingredient cetirizine, over the counter in the pharmacy. It is usually necessary to take an antihistamine for the itching. In severe cases, the doctor may also prescribe a cortisone ointment. The worn clothes should be washed and also a shower and the sucking of the apartment are advisable.

Outlook & Forecast

Grass mites are harmless parasites whose bites usually do not cause serious health problems. If a grass mite bite is instantly cooled and treated with a disinfectant, inflammation, itching, and the like will fade away within days. A medical treatment is usually not required.

Only allergic persons should seek medical advice, as they may develop further allergic reactions. An allergic reaction also resolves quickly if the patient is treated in the doctor's office and does not scratch the bite site. If the injury ignites, it can lead to a serious infection.

Possible sequelae are pain and redness. Rarely, the inflammation is dragged into surrounding tissue layers, which can cause more discomfort depending on the body regions. In general, however, grass mite bites promise a positive prognosis.

The only danger is the formation of scars. Persons who are repeatedly exposed to grass mites, for example harvest helpers or holidaymakers in tropical regions, may experience permanent skin changes. Only very rarely do the larvae stay in the body after the bite and lay eggs there. This can cause various complications such as skin damage or gastrointestinal discomfort.


In order to avoid a grass mite bite, closed clothing and tall shoes, for example rubber boots, should be worn. Socks can be worn over long pants. All this is unpleasant in midsummer. Therefore, it is advisable, before it goes into the nature, to rub with an insect repellent. The clothes can also be treated with it.

If you are in a meadow, you should take a shower and change your clothes. Textiles worn in the garden, including underwear, should be pulled out as far as possible before the apartment is entered. If you want to find out if your garden is infested with grass mites, you can lay a white leaf on the lawn on sunny days.


In a grass mite bite, no special kind of aftercare is usually possible or necessary. The patient can usually treat this bite relatively easily by a doctor so that there are no special complications or other restrictions and complaints. Even a treatment with means of self-help is possible, so that a doctor does not always have to be visited.

First and foremost, however, avoid the source of mites in a grass mite bite. The affected person should not be in the respective areas and protect himself from the mites in any case. In most cases, the complaints can be relieved relatively well with quark or with the help of salt water. However, if the grass mite bite causes shock or severe symptoms, it is important to see a doctor.

The treatment of the bite takes place with the help of medication. The bites can also be treated with a cream. Regular care should be taken to relieve the symptoms. The clothes should be washed as quickly as possible, so that the mites can not work out. As a rule, the life expectancy of the person affected by the grass mite bite is not reduced.

You can do that yourself

In the grass mite bite the person concerned has some means of self-help available. As a rule, the symptoms do not last long, but can be very unpleasant at different parts of the body.

Since it comes through the grass mite bite to a strong itching, the scratching should be avoided in any case. This only intensifies the itching and slows the healing process. Especially parents need to alert their children not to scratch the bite. The itching can be alleviated by creams or ointments from the drugstore and the pharmacy.

Likewise, lemon juice, salt water or onion juice relieve the itching and can speed healing. In severe cases, ointments with cortisone may be used or an antihistamine may be taken. Niemöl can also help against the symptoms of grass mite biting. This is applied to the affected area and can also speed healing.

In order to avoid the grass mite bite, a closed clothing should always be worn for protection. Even high shoes or boots can prevent the penetration of the mites. If the mites have got to bed, then the sheets should be washed at least 60 degrees in the washing machine.

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