Chiggers
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Chiggers

Definition

Chiggers are tiny, six-legged wingless organisms (larvae) that grow up to become a type of mite. Chiggers are found in tall grass and weeds. Their bite causes severe itching.

Alternative Names

Harvest mite; Red mite

Causes

Chiggers are found in certain outdoor areas, such as berry patches, tall grass and weeds, and woodland edges.

Chiggers bite humans around the waist, ankles, or in warm skin folds. Bites commonly occur in the summer and fall months.

Symptoms

The main symptoms are:

Itching usually occurs several hours after the chiggers attach to the skin. The bite is painless.

A skin rash may appear on the parts of the body that were exposed to the sun. It may stop where the underwear meets the legs. This is often a clue that the rash is due to chigger bites.

Exams and Tests

A doctor can diagnose chiggers by examining the rash.

Treatment

The goal of treatment is to stop the itching. Antihistamines and corticosteroid creams or lotions may be helpful.

Possible Complications

Secondary infection may occur from scratching.

When to Contact a Medical Professional

Call for an appointment with your health care provider if the rash itches very badly, or if symptoms get worse or do not improve with treatment.

Prevention

Avoid outdoor areas contaminated with chiggers, if known. Applying bug spray containing DEET to skin and clothing can help prevent chigger bites.

References

Diaz JH. Mites (including chiggers). In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2009:chap 296.

Elston DM. Arthropods and leeches. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 367.



Review Date: 10/6/2012
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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