The atopic skin routine comes down to three daily steps: wash with lukewarm water and a soap-free cleanser, pat dry without rubbing, and apply the emollient while the skin is still damp, twice a day. And do it when the skin is calm too, not only when it itches. That is the part almost everyone skips, and the part that makes the biggest difference.
The reason is that atopic dermatitis isn’t “dirty” skin, nor an allergy to one specific thing you can simply remove. It is a skin barrier that doesn’t work properly. The protective layer loses water more easily than normal, and that dryness lets irritants and allergens through, which sets off the inflammation. Mutations in the filaggrin gene — the protein that helps build that barrier — are known as one of the main genetic factors predisposing people to it. Which is why the underlying treatment isn’t anti-inflammatory: it is rebuilding barrier, every day.
The three steps of bathing
Water doesn’t dry the skin out by itself. What dries it out is hot water, soap that strips the lipids, and the time the skin spends evaporating afterwards.
| Step | How to do it | Why |
|---|---|---|
| Washing | Lukewarm water, a short shower or bath, once a day at most | Very hot water increases lipid loss and itching |
| Cleanser | A mild unperfumed bar or a soap-free cleanser (syndet) | Conventional soap is alkaline and strips the barrier |
| Drying | Pat with the towel, don’t rub | Rubbing irritates mechanically and sets off the itch-scratch cycle |
| Emollient | On skin that is still damp, without waiting for it to dry fully | Seals in the water the skin has just absorbed |
That last point has a clear physiological basis: pre-hydrating the skin increases the penetration of whatever goes on top by up to tenfold, and the most practical way to achieve it is to apply the product immediately after a bath or shower.
How much emollient you actually need
Far more than most people use. The British atopic eczema guidance, which is the source that gives concrete figures, talks about 250 to 500 grams a week of unperfumed emollients for daily use in under-12s. A 400 ml tub can last a week, not three months. If one container lasts you a quarter, you aren’t treating: you’re dabbing.
That insistence isn’t cosmetic. A Cochrane systematic review of emollients and moisturisers in eczema found that using them reduces the number of flare-ups and lengthens the time to the next one, even though the quality of the evidence is generally low to moderate. The emollient isn’t an add-on to treatment; it is the baseline treatment, and it is used when the skin looks clear too.
How to choose the product
The greasier the base, the longer it acts and the better it holds water in. For an equivalent composition, the order from greasiest down is:
- Ointment — almost entirely fats, occlusive. For very dry, scaling or thickened skin. Not in folds or on weeping lesions.
- Salve — a lot of fat and little water, more comfortable than an ointment. Trunk and limbs.
- Cream — more water than a salve, cooling. Face, folds, flexures.
- Lotion, gel and solutions — no fat or very little. Convenient on hairy areas, but they dry more than they moisturise and can sting.
Practical rule: the drier the skin and the colder the season, the further towards ointment; the hotter the weather and the more it’s a skin fold, the further towards cream. Using two different textures on the same body is perfectly normal.
On ingredients, two real warnings. Urea moisturises and aids penetration, but it can sting on cracked or badly inflamed skin. And lanolin, present in many greasy formulations, is a known cause of contact dermatitis: if a cream you have used for a long time starts irritating you, look at the ingredient list before blindly switching brands. In general, unperfumed wherever possible.
The topical steroid during a flare-up
The emollient holds the line, but it doesn’t put out a flare-up. That is what topical corticosteroids are for, classified in Spain into four potency groups: low, medium, high and very high. Hydrocortisone acetate 1%, for instance, is a non-fluorinated low-potency (group I) steroid indicated, among other things, for endogenous eczema such as atopic dermatitis.
Which potency to choose depends mostly on the area, because absorption varies enormously from one part of the body to another:
| Area | Appropriate potency |
|---|---|
| Mucous membranes, genitals, eyelids, face, inner thighs | Low or intermediate; high only for very short periods |
| Folds, flexures, inner arms, scalp | Low to high, reducing potency as soon as possible |
| Chest, back, arms, thighs, legs, backs of hands and feet | Intermediate to high, or very high for short periods |
| Elbows, knees, palms, soles, nails | High or very high, watching for side effects |
Four rules that avoid almost every problem:
- Thin layer. Excess doesn’t speed up improvement. The stratum corneum acts as a reservoir and releases the drug gradually.
- One or two applications a day are enough for most preparations.
- Limited duration. Medium and high potency shouldn’t be applied for more than four consecutive weeks; on the face or in folds, no more than two or three. The hydrocortisone 1% product information sets a general maximum of two weeks, and as short as possible on the face.
- Don’t stop abruptly. Stopping suddenly can cause rebound. The right approach is stepping down to a lower-potency steroid or alternating with emollient.
And a warning that gets overlooked: if a dermatitis that was improving on a steroid starts getting worse, one possibility is contact allergy to the steroid itself or to its base. It isn’t rare.
What is worth avoiding
- Wool and rough fabrics in direct contact with the skin.
- Perfumes, strong detergents and fragranced cosmetics on affected areas.
- Heat and sudden temperature changes. Keeping the house at a steady temperature and not overheated reduces flare-ups.
- Scratching. Keep nails short, and if the itch stops you sleeping, that is a reason to seek advice, not to put up with it.
- The smallpox vaccine. Anyone with atopic dermatitis should not receive it, even with inactive disease, because of the risk of serious complications.
Diluted bleach baths and wet wraps do appear in the guidelines, but they are regimens that get prescribed and dosed individually. They aren’t things to improvise at home.
When to see a doctor
Ask for a medical assessment if:
- Honey-coloured crusts, pus, blisters or fever appear over the lesions: this suggests infection and needs specific treatment.
- Clustered, painful blisters break out and spread quickly, especially if there is cold sore virus around.
- The itch stops you sleeping several nights in a row.
- The dermatitis doesn’t improve after two weeks of correct treatment, or gets worse just when it should be improving.
- You need a steroid continuously to keep the skin calm, or you’ve been using a potent one on the face or in folds for weeks.
- Thinning, stretch marks, visible small vessels or lightening of the skin appear in treated areas.
- Blurred vision or other visual changes occur during steroid treatment, topical included.
- You suspect a specific product is irritating you: worth identifying it before writing off a whole range.
This information is general and does not replace assessment by a healthcare professional. Sources consulted: NIAMS (NIH) — Atopic Dermatitis: Diagnosis, Treatment, and Steps to Take, NIAMS (NIH) — Atopic Dermatitis (Eczema): Symptoms & Causes, Spanish Ministry of Health — Topical corticosteroids (Inf Ter Sist Nac Salud 2010;34:83-88, in Spanish), AEMPS/CIMA — Product information, Dermosa Hidrocortisona 10 mg/g ointment (in Spanish), NICE — Atopic eczema in under 12s, quality statement 4: provision of emollients and Cochrane — Emollients and moisturizers for eczema (abridged systematic review).