II. Pathophysiology

  1. Mites
    1. Adult 8-legged Arthopods (Arachnids, same family as Spiders and ticks)
    2. Tiny Insects <1 mm long
  2. Scabies
    1. See Scabies
  3. Chiggers
    1. Six-legged larval form of mites (appear as tiny red dots on skin)
    2. Responsible for Human Bites and vector for disease
    3. Chiggers crawl onto skin when host sits or lies on lawn or grass (appear as tiny red specks)
      1. Move into constrictive clothing where they bite

III. Associated Conditions: Chigger as vector of disease

  1. Rickettsial Pox (Rickettsia akari)
  2. Scrub Typhus (outside U.S., esp. south asia)

IV. Symptoms

  1. Pruritic welts along constrictive clothing lines (waist band or sock line)

V. Signs

  1. Allergic Reaction to Chigger Bite Saliva
    1. Large welt forms at site of Chigger Bite
  2. Distribution of bite sites
    1. Occluded areas (e.g. beneath waistband, belt line or sock line)
    2. Intertriginous areas (e.g. axilla)
    3. Penis may be affected (severe in some cases)
      1. May be known as Summer Penile Syndrome
      2. Smith (1998) Pediatr Emerg Care 14(2): 116-8 [PubMed]

VI. Management

VII. Prevention

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Related Studies

Ontology: Mites (C0026231)

Definition (MSH) Any arthropod of the subclass ACARI except the TICKS. They are minute animals related to the spiders, usually having transparent or semitransparent bodies. They may be parasitic on humans and domestic animals, producing various irritations of the skin (MITE INFESTATIONS). Many mite species are important to human and veterinary medicine as both parasite and vector. Mites also infest plants.
Definition (CSP) any arthropod of the subclass Acari, except the ticks; minute animals related to the spiders, usually having transparent or semitransparent bodies; may be parasitic on humans and domestic animals, producing various irritations of the skin; many mite species are important to human and veterinary medicine as both parasite and vector; mites also infest plants.
Concepts Eukaryote (T204)
MSH D008925
SnomedCT 84073006
English Mites, mites, mite, Mite, Mite (organism), Mite, NOS
Swedish Kvalster
Czech roztoči
Finnish Pölypunkit
Croatian GRINJE
French Mites (acariens)
Polish Roztocze
Norwegian Midd
Spanish Ácaro, ácaro (organismo), ácaro, Ácaros
Portuguese Ácaro, Ácaros
German Milben
Italian Acari
Dutch Mijt, Mijten

Ontology: Chiggers (C0041171)

Definition (MSH) Family of MITES in the superfamily Trombiculoidea, suborder Prostigmata, which attack humans and other vertebrates, causing DERMATITIS and severe allergic reactions. Chiggers, red bugs, and harvest mites commonly refer to the larval stage of Trombiculid mites, the only parasitic stage of the mite's life cycle.
Concepts Eukaryote (T204)
MSH D014324
SnomedCT 106852008, 49592001, 77802003
English Chiggers, Harvest Mites, Red Bugs, Trombiculid Mites, Trombiculidae, chigger, Harvest Mite, Mite, Trombiculid, Trombiculid Mite, Mites, Harvest, Mites, Trombiculid, Mite, Harvest, Bugs, Red, Bug, Red, Red Bug, chiggers mites, red mite, trombiculidae, harvest mite, bugs red, mites red, red bug, red bugs, chiggers, Family Trombiculidae (organism), Family Trombiculidae, Family trombiculidae, Family trombiculidae (organism), Chigger, Red mite, Harvest mite, Chigger mite, Family: Trombiculidae, harvest mites, redbugs
French Trombiculidés, Aoûtats, Leptes d'automne, Trombidions, Aoutats, Trombiculides, Trombiculidae
Swedish Trombiculidkvalster
Czech Trombiculidae, sametkovití
Finnish Trombiculidae
Japanese ツツガムシ, ケダニ類, 恙虫, トロンビクラ属, アカムシ, ツツガムシ類, アカツツガムシ, ツツガムシ科
Spanish Ácaros Trombicúlidos, Trombicúlidos, Aradores, familia trombiculidae, familia Trombiculidae (organismo), familia Trombiculidae, familia trombiculidae (organismo), familia: Trombiculidae, Leptus, Niguas, Trombiculidae, Ácaros de la Cosecha
Italian Trombiculidi, Acari trombiculidi, Trombiculidae
Polish Trombiculidae
Norwegian Trombiculidae
Portuguese Níguas, Trombidiídeos, Trombidídeos, Ácaros Trombiculídeos, Micuim, Trombiculídeos, Micuins, Percevejos Vermelhos, Trombiculidae, Bicho do Pé, Micuins Trombiculídeos
German Erntemilbenlarven, Erntemilben, Rote Laufmilben, Trombiculamilben, Trombiculidae
Dutch Bosmijten, Oogstmijten, Rode spinnetjes, Mijt, bos-, Trombiculidae

Ontology: chigger bites (C0221351)

Concepts Injury or Poisoning (T037)
English bite chigger, bites chigger, chigger bite, chiggers bites, bites redbug, chigger bites, redbug bite, bites chiggers, bite chiggers, bite; chigger, chigger; bite
Dutch beet; chigger, chigger; beet

Ontology: Trombicula (C0949450)

Definition (MSH) A genus of MITES in the family TROMBICULIDAE, whose larvae cause and carry disease. The larvae attack humans and other vertebrates, causing dermatitis and severe allergic reactions. Adult forms do not bite. Species of the subgenera Leptotrombidium are the carriers of SCRUB TYPHUS.
Concepts Eukaryote (T204)
MSH D014324
SnomedCT 25532001
Czech Trombicula
Portuguese Trombicula
Spanish Trombicula, trombicula (organismo), trombicula, SAI, trombicula
French Trombicula
German Trombicula
English Trombiculas, trombicula, Trombicula (organism), Trombicula, NOS, Trombicula
Norwegian Trombicula
Dutch Trombicula