# Chigger (Eutrombicula alfreddugesi) > Very small red-orange mite whose larval stage feeds on vertebrate skin, causing intensely itchy red bites (trombiculiasis). Source: https://insectscanner.com/species/chigger/ (updated 2026-10-10) ## Is it dangerous? **Skin irritant.** Larval chiggers cause intensely itchy red bumps (trombiculiasis) where they fed. The larvae do not burrow into the skin or remain attached long-term; itching is an allergic reaction to injected digestive enzymes. In North America Eutrombicula alfreddugesi is not known to transmit serious human diseases; however secondary infection can occur from excessive scratching. First aid: wash the affected area with soap and water, apply cold compresses, topical anti-itch creams (hydrocortisone 1%) or oral antihistamines for relief. See a healthcare provider if signs of infection (increasing redness, pus, fever) develop. **Pets:** Dogs and cats can get chigger bites and show intense itching, especially around feet, belly and groin. Treat pets symptomatically; consult a veterinarian for persistent irritation or infection. Regular grooming and avoiding chigger-prone areas reduce risk. ## Quick facts - Scientific name: Eutrombicula alfreddugesi - Also called: Harvest mite, Redbug, Berry bug - Order: Trombidiformes (Trombidiform mites) - Family: Trombiculidae (Chigger mites) - Size: Adults and nymphs <1 mm; larvae 0.15-0.3 mm - Colours: Red-orange, Reddish, Pale yellow (engorged larva) - Habitat: Leaf litter, low vegetation, grassy and brushy edges, shady moist places, trail edges and lawns - Range: Widespread in the Americas, from the eastern and central United States through Mexico and Central America into South America, in suitable warm, humid habitats - Active: Late spring to early fall in temperate regions; active during warm, humid weather and mostly during daytime - Lifespan: Complete life cycle takes weeks to months depending on temperature and food; individual adults may live weeks to months in favorable conditions - Effect on plants: Harmless - Pest: yes ## Overview Eutrombicula alfreddugesi is a species of mite whose microscopic larvae (commonly called chiggers) feed temporarily on the skin of vertebrates, including humans. Larvae inject digestive enzymes into the host and feed on the liquefied tissue; they do not burrow into the skin. Nymphs and adults are free-living predators of tiny arthropods and are usually found in soil and leaf litter. This species is common in warm, humid parts of the Americas and is most active in late spring through early fall. ## How to identify it Adults and nymphs are tiny mites, often less than 1 mm and difficult to see without magnification. The parasitic larval stage is bright red to orange and round, about 0.15-0.3 mm across — visible only as tiny red dots on skin or fabric. Larvae may appear in clusters. After feeding they detach and continue development in the environment. - Look for intensely itchy red papules or clusters of bumps on ankles, waist, under straps and behind knees after time in tall grass or leaf litter. - Larvae appear as tiny bright red or orange dots tightly grouped; use a magnifier to see them on skin or clothing. - Bites often appear in areas where clothing fits tightly (sock or belt lines) rather than exposed skin. - Timing: bites typically develop hours to a day after exposure and produce severe itching that peaks over several days. ## Lookalikes - **Scrub typhus mite** (Leptotrombidium spp.): Lookalike chigger larvae in Asia that can transmit scrub typhus; distinguished by geography and microscopic features — Eutrombicula alfreddugesi occurs in North America and is not a known scrub typhus vector. - **Other Trombiculidae chiggers** (Various Trombiculidae species): Many chigger species look identical to the eye; species-level ID requires microscopy and expert examination. Behavior and habitat are similar. ## Life cycle - **Egg:** Eggs are laid in soil or leaf litter and hatch into six-legged larvae. - **Larva (chigger):** Six-legged parasitic stage; larvae attach briefly to vertebrate hosts, inject enzymes to digest skin cells and feed on the resulting tissue, then drop off to continue development. - **Nymph:** Eight-legged predatory stage living in soil and litter; molts through one or more nymphal instars before becoming an adult. - **Adult:** Eight-legged predatory mite that lives in the environment and feeds on tiny arthropods and eggs. ## Diet and predators - Young eat: Larvae feed on liquefied skin cells of vertebrates (temporary parasitism). - Adults eat: Adults and nymphs prey on tiny arthropods and their eggs in soil and leaf litter. - Predators of the young: Ground-dwelling predators such as other mites, ants and spiders may eat larvae, and birds may remove them during grooming. - Predators of adults: Predatory arthropods, ground beetles, spiders and small insectivorous birds reduce mite numbers. ## Effect on plants and gardens Chiggers do not feed on plants and have no direct harmful effect on gardens or crops. ### How to get rid of it Reduce habitat: keep lawns mown, remove leaf litter, clear brush and stone piles, create dry, sunny margins. Personal protection: use insect repellents containing DEET or permethrin-treated clothing, tuck pants into socks and avoid sitting directly on bare ground in infested areas. After exposure, wash clothing in hot water and shower promptly. For yard control, targeted insecticide treatments (acaricides) may reduce numbers but are often temporary and should be used according to label directions; professional pest control can advise on larger infestations. ## Where and when to find it Check low vegetation, shady lawns, trail edges, leaf litter and brushy margins for larvae on vegetation and for bites on hosts. Adults and nymphs are found in soil and litter. - Best time: Late spring through early fall during warm, humid weather; daytime when conditions are moist. - Tips: Wear protective clothing, tuck pant legs into socks and use repellents. After a hike, shower and change clothes promptly; inspect skin folds and clothing seams where larvae commonly attach. ## Fun facts - The term 'chigger' refers specifically to the larval stage; nymphs and adults are predatory and harmless to humans. - Chiggers do not burrow into skin; the visible sore is an allergic reaction to their injected digestive enzymes. - A single chigger larva is about 0.2 mm across — smaller than a sesame seed and often missed until the bite it caused itches. ## Frequently asked questions ### Do chiggers burrow into your skin? No. Larval chiggers attach briefly and inject enzymes that digest skin cells; they do not tunnel under the skin or live there. ### Do chiggers transmit disease? Eutrombicula alfreddugesi in North America is not known to transmit major human diseases. Some related species in Asia can transmit scrub typhus, but that is not a concern with this species in its normal range. ### How do I get rid of chiggers on my body? Shower and wash with soap and hot water as soon as possible after exposure, scrub affected areas, and launder clothing in hot water. Treat itch with topical hydrocortisone or oral antihistamines; seek medical care for signs of infection. ### Why am I getting bitten around my waist and ankles? Chiggers favor warm, moist areas and bites often occur where clothing fits tightly (waistbands, sock lines) because larvae become trapped there and feed. ### How can I prevent chigger bites when hiking? Wear long pants tucked into socks, use repellents containing DEET on skin and permethrin on clothing, avoid sitting on bare ground or in tall grass, and stay on cleared trails. ### Can pets bring chiggers into the house? Pets can pick up chiggers outdoors and carry them on fur, but larvae feed briefly and detach; wash pets and bedding after suspected exposure and treat pets for itching if needed. --- More about this species: [iNaturalist](https://www.inaturalist.org/taxa/263228), [Wikipedia](https://en.wikipedia.org/wiki/Eutrombicula_alfreddugesi). Identify insects and spiders from a photo with the Insect Scanner iPhone app: https://apps.apple.com/app/id1543946563?pt=126685406&ct=web-markdown&mt=8 Identification from photos is never certain: don't handle insects you can't identify, and get medical advice for bites, stings or allergic reactions.