Merino Wool and Eczema: Check Which Fabric Was Studied

The AAD’s current atopic-dermatitis advice favors loose, 100% cotton clothing and says to avoid wool next to the skin. So why do some merino garments cite eczema studies? The trials used particular fine-fiber fabrics, and their results do not settle the question for every wool top.¹

What the mixed-age trial actually supplied

A 2019 trial analyzed 50 completers from 56 people enrolled with mild-to-moderate atopic dermatitis. Eligibility started at age five; completers averaged 26.7 years.²

They wore their usual clothing for six weeks and a merino ensemble for six weeks, in randomized order. The supplied top and bottom were 100% merino with mean fiber diameter no greater than 17.5 micrometers. Participants were asked to wear an ensemble for at least six continuous hours daily. The comparison was their own non-wool clothing, not a standardized cotton outfit.²

Eczema-severity and quality-of-life scores were better during merino wear. Measured skin hydration did not significantly differ. Assessors were blinded to clothing assignment, but participants could not be. The published results excluded the six noncompleters, and a single fabric quality was tested.²

Australian Wool Innovation funded the research. The findings do not establish that all merino fabrics treat eczema.²

The infant study answers a different question

The 2017 DESSINE study enrolled 39 children aged about one month to three years. It compared superfine merino ensembles with cotton clothing selected by parents, switching materials after six weeks. Assessors were blinded; families knew what the children wore.³

The first six weeks did not show a significant difference between groups in change in the objective eczema score, SCORAD. Children who switched from cotton to wool subsequently improved more; scores worsened after switching the other way. The authors’ combined analyses favored wool, but this sequence matters when reading a claim that it simply “beat cotton.”³

There were fewer children assessed by the end: the table reports 27 with twelve-week SCORAD data. Australian Wool Innovation provided funding, garments and fabric washes. The sponsor also assisted with access to wool literature; the paper says it did not direct the study design, analysis or publication.³

An infant trial cannot provide an adult treatment estimate. It also cannot identify which off-the-shelf garment will feel comfortable on your skin.

What a shopping label leaves unanswered

Ask for the garment’s fiber diameter and composition. “Merino” alone does not establish a match to the trial’s fabric, knit or garment construction.²

Eczema UK notes that overheating, sweating, rough seams, fibers, fastenings and threads can all contribute to discomfort. Its clothing guidance also points out that “cotton rich” can include a substantial polyester proportion. Read percentages, and inspect the areas that will touch your skin.⁴

Those details give you better questions than a promise such as “natural and eczema-friendly.” They do not require you to buy a new wardrobe to find an answer.

Keep your treatment and comfort in view

The AAD recommends fragrance-free, dye-free detergent, washing new clothes before wear and removing irritating tags. It also emphasizes an individualized eczema plan with a dermatologist, including medication or phototherapy when needed. A clothing experiment should not replace that plan.¹

If you are considering fine merino despite earlier wool irritation, take the product specification and the cited study to your clinician. If a garment makes you itch or overheat, the research is not a reason to keep wearing it.

Skin, Head to Toe asks readers to bring their history of tried products and treatments to appointments, with photographs when names are difficult to recall. Include the clothing label and a note about where, when and under which garment your symptoms changed. See the book.