
Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Chiggers
Introduction
Overview
Overview
Chigger or chigoe can refer to either of two parasitic arthropods with similar behaviors: the chigoe flea (Tunga penetrans), found in tropical climates and the larva of a harvest mite that, when carrying a tiny parasite called Orientia tsutsugamushi, causes scrub typhus. The larvae are also called scrub mite, red mite and several other names, and they are found throughout temperate and tropical zones; the name chigger originated as a corruption of chigoe, but the harvest mite is what is most commonly called a chigger in North America.
Pathophysiology
Pathophysiology
- Chiggers do burrow into the skin but do not suck blood. It attaches to its host, injects digestive enzymes into the bite wound, and then sucks up the digested tissue.
- Warm, rainy days make these parasitic and predatory mites reproduce into large populations. Once the ground temperature is regularly above 60°F, the harvest mite lays eggs, and “chigger season” is underway. This season typically begins in April and ends in the early autumn/first “frost.”
- Chiggers do not like sunlight or humidity. During the wet season, chiggers are usually found in tall grass and other vegetation.
- During dry seasons, chiggers are most found underneath brush and shady areas.
Treatment
Treatment
Medical Treatment
To reduce the itching, apply an anti-itch cream that contains hydrocortisone, calamine, or benzyl benzoate. If you are sensitive to these medications or have questions, be sure to ask your health-care professional or pharmacist
Prevention
- Keep grass short.
- Remove brush and wood debris where potential mite hosts may live.
- Keep major host away from the area, such as – rodents and other small mammals. Secure trash cans to discourage wildlife from coming near your home.
- Sunlight that penetrates the grass will make the lawn drier and make it less favorable for chigger survival.
- Apply insect repellant to your feet, legs, and mid-section.
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Cafer Zorkun, M.D., Ph.D. [2]
