Irritation and allergy are different
Skin or breathing reactions to cleaning products fall into two broad groups, and telling them apart helps you decide what to change.
Irritation is a direct effect of a substance on skin, eyes or airways. It can happen to anyone if exposure is high enough or long enough. Frequent contact with detergents, which strip the skin’s natural oils, is a common cause of dry, sore or cracked hands. Strong products such as bleach or oven cleaner can also irritate the nose, throat or eyes through fumes.
Allergy involves the immune system. It affects only people who have become sensitised to a particular substance, and a very small amount can then trigger a reaction. Contact allergy on the skin often appears as an itchy, red rash some hours to a couple of days after exposure. Some people also report sneezing, wheezing or headaches around scented products, though the mechanism of these symptoms is not always clear and may involve irritation rather than a true allergy.
Neither category is something this article can diagnose. If you have persistent symptoms, a doctor or pharmacist can advise, and a dermatologist can arrange testing to identify what you react to.
Why fragrance features so often
Fragrance is a common cause of reactions in household and personal products. A single word such as “fragrance” or “parfum” on a label may stand for a mixture of many individual compounds. In some regions, certain well-known fragrance allergens must be listed by name above a threshold, while the rest of the blend may not be listed individually. Rules differ by country, so what you see on a pack depends on where you live.
Natural does not mean gentle. Essential oils and plant extracts are complex mixtures that can also cause reactions, and some are well-known sensitisers. Describing a product as “plant-based” or “naturally scented” says little about how likely it is to irritate. The reverse also holds: a synthetic ingredient is not automatically a problem.
Other common irritants and triggers
Besides fragrance, ingredients and factors that are often involved include:
- Surfactants (detergents) in washing-up liquid, multi-surface sprays and hand soaps, which can dry out skin with repeated contact. The basics are covered in the explanation of cleaning chemistry basics.
- Preservatives, which are added to water-based products to stop microbial growth. A few are known contact allergens for some people. Preservatives are a reason homemade products are a different proposition: they are not preserved or tested like commercial ones.
- Dyes and colourants.
- Strong alkalis and acids, found in drain, oven and limescale cleaners, which can burn skin and eyes.
- Bleach and disinfectants, whose fumes can irritate the airways, especially in a small or poorly ventilated space. People with asthma are often advised to take extra care with sprays.
- Wet work itself. Spending long periods with hands in water, or wearing gloves that trap sweat, is a risk factor for hand dermatitis.
What fragrance-free means, and what it does not
Label wording is not always consistent, and it pays to read it closely.
- Fragrance-free generally means no fragrance ingredients have been added, though the definition is not always the same between brands or countries.
- Unscented can mean that a masking agent was added to cancel a smell, rather than that nothing was added. It is a weaker guarantee.
- Hypoallergenic and dermatologically tested are marketing terms. They do not promise that a product will not cause a reaction, and the testing referred to is not always described.
- Natural, eco and gentle have no consistent meaning. Broader problems with this kind of wording are discussed in the piece on greenwashing claims.
The ingredient list, where available, is more useful than front-of-pack claims. Some brands publish full ingredient lists online. Independent marks can help in some cases, and what they do and do not cover is described under eco-label certifications.
Patch testing a new product
A simple home patch test can reveal an obvious reaction before you use a product all over your hands or body. It does not guarantee safety and is not a substitute for medical advice.
- Choose a product you intend to use. For a cleaner, dilute it as the label directs, and for skin-contact products follow the label.
- Apply a small amount to a patch of skin on the inner forearm or behind the ear, as is commonly suggested.
- Leave it for the time the label states, or the period a typical user would be exposed, then rinse.
- Watch the area for at least 24 hours, and ideally up to two days, since some allergic reactions appear later.
- If redness, itching, swelling or blistering appears, wash the area with water and stop using the product. Seek medical advice for anything severe, and contact a doctor urgently if you have swelling of the face or difficulty breathing.
For homemade skincare or cleaning mixtures, patch testing matters even more, as discussed in the articles on DIY skincare recipes and homemade cleaners. Do not patch test a product that is not intended to touch skin, such as drain cleaner.
Practical ways to reduce reactions
- Choose fragrance-free versions where you can, and use less product rather than more.
- Wear gloves for wet or heavy cleaning, ideally with a cotton liner for long jobs, and moisturise afterwards.
- Ventilate while cleaning and avoid spraying where wiping will do.
- Do not combine products, because mixing cleaners can create fumes that irritate or injure the lungs.
- Rinse surfaces that touch skin or food, such as baby equipment, if the label advises.
- Keep a note of what you were using when symptoms began, which helps a clinician work out the cause.
- If a particular household member has asthma or eczema, ask their doctor about products to avoid.
Children and pets
Skin and airways in small children can react more readily, and pets may lick surfaces or paws after cleaning. Rinse and dry floors where practical, and keep products out of reach, following the storage advice in the chemical storage guidance. If someone swallows a product or gets it in their eyes, rinse as the label suggests and contact a poison helpline or emergency services.
This is general information, not medical advice.