SOS Allergo · I understand & manage
HOUSE DUST MITES
Understand house dust mite allergy and which measures in the bedroom and bedding are genuinely worthwhile.
A positive skin-prick test or blood test to house dust mites shows that your body is sensitised. It is also necessary to establish whether mites can genuinely explain your symptoms.
Prolonged exposure is often greatest in bedding and bedroom textiles.
Ventilate daily, avoid overheating the bedroom and excess humidity, and clean bedding regularly.
A mite-proof cover, a vacuum cleaner with a HEPA filter or removing a carpet may reduce exposure, but none guarantees symptom improvement on its own.
Mites occur naturally in our environment. The aim is to reduce exposure reasonably when it is genuinely relevant, not to make the home perfectly sterile.
House dust mites are microscopic organisms that cannot be seen with the naked eye.
They particularly favour warm, humid environments and readily grow where dust and skin debris accumulate: mattresses, pillows, duvets, rugs, carpets, armchairs, sofas and other textiles.
They are not simply ‘dust’ and they do not bite.
In some people, proteins from mite debris and faeces may trigger an allergic reaction.
When house dust mites genuinely contribute to allergy, they may be associated with:
Unlike pollen, house dust mites are present in homes throughout the year. Symptoms may therefore persist, although their intensity may vary with the home, humidity, season and other exposures.
Key point for interpreting the test
Sensitisation ≠ the allergy causing your symptoms
A positive skin-prick test or the presence of specific IgE means that your immune system recognises house dust mite allergens.
It does not automatically prove that they explain your symptoms.
To determine whether mites genuinely play a role, the doctor also considers:
A test result must therefore always be interpreted alongside your clinical history.
Priority actions
If your doctor considers that house dust mites contribute to your symptoms, it is generally unnecessary to change everything in your home.
We spend several hours each night in contact with bedding.
Begin with simple measures concerning:
Ventilate the bedroom and other rooms every day, including in winter.
Ventilation helps renew the air and limit excessive indoor humidity.
Also ensure that the home’s ventilation systems remain unobstructed and functional.
House dust mites grow better in warm, humid environments.
A bedroom temperature no higher than about 20°C is generally advised.
This does not mean that you should be cold: the main aim is to avoid unnecessarily overheating the bedroom.
A few simple actions may help:
If your home remains very humid despite these measures, discuss this with your doctor.
Wash sheets and bed linen regularly.
Where the textile allows, washing at around 55 to 60°C reduces mites and their allergens more effectively.
However, follow the manufacturer’s washing instructions.
Washing is useful for reducing exposure, but it is not a treatment for allergy on its own.
These are simple, low-cost measures that help improve the indoor environment.
Washing bed linen, where possible at a sufficiently high temperature, helps reduce exposure to house dust mites.
A reasonable measure applied regularly is generally preferable to a long list of constraints that cannot be maintained.
Covers designed as allergen barriers may reduce exposure in bedding.
However, their use does not guarantee symptom improvement, particularly when they are the only measure used.
Before a major purchase, ask your doctor or allergist for advice.
They can act as reservoirs for dust and allergens.
If you are refurbishing a bedroom, an easy-to-clean floor may be preferable.
However, it is generally unnecessary to begin costly work immediately or refurbish the entire home solely because a house dust mite test is positive.
A vacuum cleaner with suitable filtration may help reduce dust.
However, buying an expensive vacuum cleaner with a HEPA filter is not a treatment for allergy, and its clinical benefit when used alone has not been clearly demonstrated.
If you already own an effective, well-maintained appliance, use it normally.
Soft toys are not prohibited.
For a child with house dust mite allergy, it is practical to keep a reasonable number of soft toys that can be cleaned easily.
When washable, clean them regularly according to the manufacturer’s instructions.
No.
Freezing may kill some mites, but killing a mite does not remove allergens already present in the soft toy.
Cleaning therefore remains important.
There is no need to turn a child’s bedroom into an empty room in an attempt to remove every mite.
Not routinely.
House dust mite allergens are widely present in dust and textiles and do not remain only suspended in the air.
Some air-purification techniques are being studied, but evidence does not support routinely recommending an air purifier to everyone with house dust mite allergy.
It is therefore not a first-line priority purchase.
If you are considering an expensive appliance because of significant symptoms, discuss it with your doctor first.
Be cautious about commercial claims.
Acaricides and other chemical treatments may sometimes reduce some mite populations, but their benefit on symptoms has not been clearly demonstrated.
Some sprays, home fragrances, diffusers and essential oils may also release irritating substances into the air, which can be particularly troublesome for people with asthma or sensitive airways.
Using many products in the home is therefore not necessarily a good strategy.
Not exactly.
House dust mites are microscopic organisms. Their allergens may be found in dust.
No.
A positive test shows sensitisation. It is necessary to establish whether that sensitisation is clinically relevant.
Not necessarily.
A cover may reduce exposure but does not consistently improve symptoms when used alone.
No.
Simply prioritise those that are easy to clean and avoid excessive accumulation.
No.
It may kill mites, but allergens already present remain in the textile until removed by cleaning.
No.
These appliances are not essential for everyone with house dust mite allergy.
No.
House dust mite allergy does not require disinfecting the home. Some household products or sprays may even irritate the airways.
No.
The presence of house dust mites is not a sign of a ‘dirty’ home.
An allergy is not caused by poor hygiene, and eliminating every mite from a home is practically impossible.
The aim is a reasonable reduction in exposure, not a sterile home.
There is therefore no need to spend many extra hours cleaning or blame yourself if some mites remain: this is normal.
If you notice:
discuss this with your doctor or allergist.
In some parts of France, an Indoor Environment Counselor / Medical Indoor Environment Counselor (CEI/CMEI – France), where available and following a medical request, can assess the home environment and suggest adapted measures.
This may be more useful than successively buying several appliances without knowing which are genuinely necessary.
Environmental measures do not replace treatment for rhinitis or asthma.
If your symptoms remain troublesome, your doctor can reassess:
Never reduce or stop a treatment on your own because you have changed your environment.
If you have a personalised asthma action plan, it continues to take priority.
Référence 1 — Recommandation internationale asthme
Global Initiative for Asthma (GINA). Global Strategy for Asthma Management and Prevention. 2026 Update. Global Initiative for Asthma; 2026.
Référence 2 — Méta-analyse récente sur l’éviction
Sobczak M, Kowal K, Pawliczak R. Are There Effective Methods to Reduce Exposure to House Dust Mite Allergens? A Meta-Analysis of Randomized Clinical Trials. Int Forum Allergy Rhinol. 2025;15(8):792-802. DOI: 10.1002/alr.23565. PMID : 40089899.
Référence 3 — Méta-analyse sur les stratégies combinées
van Boven FE, Braunstahl GJ, Arends LR, van Maaren MS, Bramer WM, Gerth van Wijk R, de Jong NW. House dust mite allergen avoidance strategies for the treatment of allergic asthma: A hypothesis-generating meta-analysis. World Allergy Organ J. 2024;17(6):100919. DOI: 10.1016/j.waojou.2024.100919. PMID : 38966606.
Référence 4 — Rhinite allergique et mesures non pharmacologiques
Park DY, Lee YJ, Kim DK, et al. KAAACI Allergic Rhinitis Guidelines: Part 2. Update in Non-pharmacological Management. Allergy Asthma Immunol Res. 2023;15(2):145-159. DOI: 10.4168/aair.2023.15.2.145. PMID : 37021502.
Référence 5 — Practice parameter sur les acariens
Portnoy J, Miller JD, Williams PB, et al. Environmental assessment and exposure control of dust mites: a practice parameter. Ann Allergy Asthma Immunol. 2013;111(6):465-507. DOI: 10.1016/j.anai.2013.09.018. PMID : 24267359.
Référence 6 — EAACI, rhinoconjonctivite et immunothérapie
Roberts G, Pfaar O, Akdis CA, et al. EAACI Guidelines on Allergen Immunotherapy: Allergic rhinoconjunctivitis. Allergy. 2018;73(4):765-798. DOI: 10.1111/all.13317. PMID : 28940458.
Référence 7 — EAACI, asthme lié aux acariens
Agache I, Lau S, Akdis CA, et al. EAACI Guidelines on Allergen Immunotherapy: House dust mite-driven allergic asthma. Allergy. 2019;74(5):855-873. DOI: 10.1111/all.13749. PMID : 31095767.
Patient resources on allergic rhinitis, allergic asthma, the indoor environment and reducing allergen exposure.
French Ministry of Health
Resources on indoor air quality, ventilation, the home environment and the Indoor Environment Counselor / Medical Indoor Environment Counselor (CEI/CMEI – France).
Latest scientific review: September 2026
SOS Allergo — Information for patients and carers. This sheet does not replace a medical consultation or personalised advice from your healthcare professional.
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