|Classification and external resources|
Chigger bites on the foot and ankle
|ICD-10||B88.0 (ILDS B88.010)|
Chiggers are commonly found on the tip of blades of grasses to catch a host, so keeping grass short, and removing brush and wood debris where potential mite hosts may live, can limit their impact on an area. Sunlight that penetrates the grass will make the lawn drier and make it less favorable for chigger survival.
Chiggers seem to affect warm covered areas of the body more than drier areas. Thus, the bites are often clustered behind the knees, or beneath tight undergarments such as socks, underwear, or brassieres. Areas higher in the body (chest, back, waist-band, and under-arms) are affected more easily in small children than in adults, since children are shorter and are more likely than adults come in contact with low-lying vegetation and dry grass where chiggers thrive. An exceptional case has been recently described in the eye, producing conjunctivitis.
Application of repellent to the shoes, lower trousers and skin is also useful. Because they are found in grass, staying on trails, roads, or paths can prevent contact. Dusting sulfur is used commercially for mite control and can be used to control chiggers in yards. The dusting of shoes, socks and trouser legs with sulfur can be highly effective in repelling chiggers.
Another good strategy is to recognize the chigger habitat to avoid exposure in the first place. Chiggers in North America thrive late in summer, in dry tall grasses and other thick, unshaded vegetation. Insect repellents containing one of the following active ingredients are recommended: DEET, catnip oil extract (nepetalactone), citronella oil or eucalyptus oil extract. However, in 1993 issue a study reported on tests of two commercial repellents: DEET and citrus oil: "All chiggers exposed on the filter papers treated with DEET died and did not move off the treated papers. None of the chiggers that were placed on papers treated with citrus oil were killed." It was concluded that DEET was more effective than citrus oil.
||This section may require cleanup to meet Wikipedia's quality standards. The specific problem is: date-June 2009. (June 2009)|
To reduce the itching, an application of anti-itch cream containing hydrocortisone, calamine, or benzyl benzoate is often used (though calamine has been shown not to be effective). Hydrogen peroxide and capsaicin cream has also been effective. Another good way to relieve itching is to apply heat—either by using a hand held shower with water hot as one can stand, or by heating the bite with a hair dryer. The heat method will relieve itching for about four hours and will require repeating. Applying fingernail polish to the affected area does not kill the chigger; the chigger is actually no longer present by the time a rash is noticed.
The most effective way of removing chiggers is by washing the affected areas with warm water and soap. This must be done as soon as possible after exposure or possible exposure. Carefully wash the ankles, feet, behind the knees, and under the arms and chest. An Epsom salt bath may help alleviate itching. If one is near the seashore, wading for a few minutes in salt water will both get rid of the mites on one's skin and clothing and also alleviate the itching from their bites. Clothing, especially underwear, should be immediately discarded after returning from areas where exposure may have occurred. However, once symptoms appear, it may be too late to prevent further bites. Taking a hot bath when already covered with chigger bites may in fact be very uncomfortable and increase itching symptoms. Do not rub and scratch the skin aggressively, as this can break the skin and leave it vulnerable to a more serious infection.
In some cases, the chigger is still present when the bite appears. A 10X magnifier can be used to see the chigger and it may be removed with fine-tipped tweezers. Once it is gone, covering the bite with nail polish, calamine lotion, vaseline or other petroleum jelly, baby oil, or anything else may help the pain and itching, but will neither suffocate the chigger nor help the bites heal any faster. Medication such as antihistamines or corticosteroid creams may be prescribed by doctors, and might help in some instances.
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- Parcell, B. J., Sharpe, G., Jones, B. & Alexander, C. L. 2013: Conjunctivitis induced by a red bodied mite, Neotrombicula autumnalis. Parasite, 20, 25. doi:10.1051/parasite/2013025
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- Schalock, Peter C. (Last full review/revision December 2006). "Itching: itching and Noninfectious rashes". The Merk Manuals Medical Library. Retrieved 2009-05-19.