Chiggers are tiny, 6-legged wingless organisms (larvae) that mature to become a type of mite. Chiggers are found in tall grass and weeds. Their bite causes severe itching.
Harvest mite; Red mite
Chiggers are found in certain outdoor areas, such as:
- Berry patches
- Tall grass and weeds
- Edges of woodlands
Chiggers bite humans around the waist, ankles, or in warm skin folds. Bites commonly occur in the summer and fall months.
The main symptoms of chigger bites are:
- Severe itching
- Red pimple-like bumps or hives
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
Your health care provider can usually diagnose chiggers by examining the rash. You'll likely be asked about your outdoor activity. A special magnifying scope may be used to find the chiggers on the skin. This helps confirm the diagnosis.
The goal of treatment is to stop the itching. Antihistamines and corticosteroid creams or lotions may be helpful. Antibiotics are not necessary unless you also have another skin infection.
A secondary infection may occur from scratching.
When to Contact a Medical Professional
Call your provider if the rash itches very badly, or if your symptoms get worse or do not improve with treatment.
Avoid outdoor areas that you know are contaminated with chiggers. Applying bug spray containing DEET to skin and clothing can help prevent chigger bites.
Diaz JH. Mites, including chiggers. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases, Updated Edition. 8th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 297.
James WD, Berger TG, Elston DM. Parasitic infestations, stings, and bites. In: James WD, Berger TG, Elston DM, eds. Andrews' Diseases of the Skin. 12th ed. Philadelphia, PA: Elsevier; 2016:chap 20.