Symptoms
Dust mite allergy symptoms include:

Cough
Facial pressure and pain
Itchy, red or watery eyes
Itchy nose, roof of the mouth or throat
Nasal congestion
Postnasal drip
Runny nose, sneezing
Swollen, blue-colored skin under the eyesIf the dust mite allergy contributes to asthma:

Audible whistling or wheezing sound when exhaling
Bouts of coughing or wheezing that are worsened by a respiratory virus such as a cold or the flu
Chest tightness or pain
Difficulty breathing
Trouble sleeping caused by shortness of breath, coughing or wheezing

Cross-reactivity to shellfish allergy
Tropomyosin, the major allergen in dust mites, is also responsible for shellfish allergy. Exposure to inhaled tropomyosins from dust mites is thought to be the primary sensitizer for shellfish allergy, an example of inhalant-to-food cross-reactivity. Epidemiological surveys have confirmed correlation between shellfish and dust mite sensitizations. An additional confirmation was seen in Orthodox Jews with no history of shellfish consumption, in that skin tests confirming dust mite allergy were also positive for shellfish tropomyosin. In addition to tropomyosin, the proteins arginine kinase and hemocyanin seem to have a role in cross-reactivity to dust mites. Prevention
House dust mites are present indoors wherever humans live. Positive tests for dust mite allergies are extremely common among people with asthma. Dust mites are microscopic arachnids whose primary food is dead human skin cells, but they do not live on living people. They and their feces and other allergens that they produce are major constituents of house dust, but because they are so heavy they are not suspended for long in the air.
Subcutaneous immunotherapy is the most common form and has the largest body of evidence supporting its effectiveness. Subcutaneous Immunotherapy (SCIT)
Subcutaneous Immunotherapy (SCIT) also known as Allergy Shots are series of shots/injections of the allergen given into the fat under the skin that have progressively larger amounts of allergen. These shots can be given to the Kids as young as 5 years old. Sublingual immunotherapy (SLIT)
HDM-SLIT tablet, House Dust Mites (Dermatophagoides farinae and Dermatophagoides pteronyssinus) Allergen Extract (Trade-names: ODACTRA, ACARIZAX & MITICURE), is the only FDA approved allergen extract for the immunotherapic treatment of adolescents (12–17 years) and adults (18–65 years). It significantly treats house dust mite (HDM)-induced allergic rhinitis, with or without conjunctivitis. It has been approved in almost all over the world with countries like Japan, Russia, South-East Asia, Turkey, the Middle East, New Zealand and 14 European countries. Further reading
List of mites associated with cutaneous reactions
List of allergens
House dust mite
Allergy
Asthma and Allergy Friendly
Allergic rhinitis

References
External links
House Dust Mite Injection (Dermatophagoides Pteronyssinus): Uses, Dosage, Side Effects, Interactions, Warning