HEALTH AT WORK

Industrial Health

Barista Developing Burned Forearm Skin After Years of Steam Wand Splashback

4 October 2026 · Health at Work · AI-assisted draft

Photo: Nikita Grimovich / Pexels

A barista who has worked a commercial espresso machine for several years may notice something troubling on the inner forearms: patches of skin that look permanently reddened, thickened, or strangely mottled. The natural assumption is that these are old scald marks that never fully healed. In some cases that is partly true, but the full picture is different and more serious. What is happening is a pattern of repeated low-level thermal injury, layered over months and years, that changes the structure of the skin itself. This article explains what is actually occurring, why it progresses the way it does, and what both workers and employers must do before the damage becomes irreversible.

What Steam Wand Splashback Actually Does to Skin

The steam emitted from a commercial espresso machine wand reaches temperatures between 120 and 150 degrees Celsius. A single, brief exposure to steam at that temperature causes a superficial scald — painful, red, sometimes blistered, but usually healed within days. That is what most people picture when they think of a burn injury in a cafe kitchen.

The occupational reality for a full-time barista is quite different. On a busy shift, a barista may steam milk dozens of times per hour. Each time the wand is purged before or after use, a fine spray of condensate and steam can travel 15 to 30 centimetres from the tip. Each individual event may feel like nothing more than a brief sting — too quick and too small to register as a proper burn. But skin that is exposed to these micro-scalds repeatedly, day after day, undergoes cumulative thermal damage that does not resolve fully between shifts.

The deeper consequence is a process called chronic thermal damage or erythema ab igne — a condition in which repeated low-intensity heat causes persistent dilation of small blood vessels near the skin surface, followed by localised melanin deposition and, over time, structural changes in the dermis. The characteristic sign is a reticulated, net-like pattern of redness or brown pigmentation on the forearms, particularly on the inner surface of the dominant arm and the non-dominant arm used to hold the milk jug. In some cases the skin becomes atrophic — thinner than normal — and loses some of its normal elasticity.

This is not a cosmetic issue. Research into erythema ab igne documents that areas of chronically heat-damaged skin carry a small but real elevated risk of pre-malignant change over many years, particularly in skin that is also exposed to other irritants. For baristas who also work with cleaning chemicals used in backbar hygiene, the skin barrier on the forearms may already be compromised, which increases both the rate of thermal damage and the risk of secondary irritant contact dermatitis developing in the same areas.

Who Is Most Affected and Why

The risk is highest for baristas working on high-volume machines — typically those in city-centre cafes, airport outlets, hotel breakfast services, or workplace coffee stations where output is continuous. A barista producing 200 to 400 milk-based drinks per shift faces a fundamentally different cumulative exposure than one working at a quieter pace.

Left-handed baristas and those who position their non-dominant arm close to the steam wand during steaming tend to show damage on the arm used to stabilise the jug rather than the hand holding it. The position is habitual and rarely questioned, which is part of why the exposure accumulates unnoticed. Baristas who purge the wand vigorously — a step that clears residual milk from the tip — generate the largest aerosol of hot condensate and face the highest per-event exposure.

Newer staff are often unaware the risk exists. Experienced baristas sometimes normalise the skin changes, describing them as 'just part of the job'. Neither is an acceptable outcome.

Recognising the Signs: Early and Late

Early signs are easy to miss because each individual scald is minor. A barista at the beginning of cumulative thermal exposure may notice: a persistent pink or red flush on the inner forearm that does not go away overnight; occasional itching or a burning sensation that lingers after a shift ends; small, dry patches that do not respond to ordinary moisturiser.

As exposure continues over months, the pattern becomes more clearly reticulated — the characteristic lace-like network of discolouration becomes visible. The skin may feel slightly rough to the touch in those areas. In more advanced cases, the pigmentation becomes fixed and no longer fades during time off work, which is the point at which the change has moved from a vascular response to a structural one. Some workers in this stage report that the affected skin is more sensitive to temperature change generally — reacting more strongly to cold water or wind than unaffected skin on the same arm.

The signs a worker or employer should treat as requiring professional assessment include: any area that does not fade after two weeks away from work; any lesion that develops a raised, rough, or ulcerated surface; any persistent change in skin texture rather than just colour; or any area that bleeds spontaneously or following minimal contact.

What Employers Are Required to Do

Under typical occupational health regulations, an employer operating a commercial kitchen or cafe is required to identify thermal hazards, assess the risk they pose to workers, and implement controls proportionate to that risk. Steam wand splashback is a thermal hazard. The fact that individual exposures are brief does not eliminate the employer's duty — cumulative exposure to a hazard that causes harm over time is still a hazard that must be managed.

Employers are specifically required to: include steam wand operation in their workplace risk assessment and review that assessment when working practices change; ensure that workers are informed about the cumulative risk of repeated steam exposure — not just acute burn first aid; provide appropriate personal protective equipment where engineering controls cannot fully eliminate the exposure; and arrange for occupational health review for any worker who reports persistent skin changes on the forearms consistent with thermal exposure.

Failure to include a recognised thermal hazard in a workplace risk assessment is a regulatory failing in most jurisdictions. The argument that 'no one has complained before' is not a defence when the hazard is objectively present and the harm is documented in occupational health literature.

Practical Controls That Actually Work

Controls should be considered in order of effectiveness, from eliminating or reducing the hazard at source to protecting the worker when source reduction is not fully achievable.

• Machine positioning and wand design: Some commercial machines allow the steam wand angle to be adjusted so that the purge spray travels away from the operator rather than towards them. This is worth requesting from equipment suppliers. Auto-steam wands, now available on several commercial machine models, reduce direct manual contact with the wand during steaming and substantially reduce splashback exposure during purging.
• Purging technique and training: Directing the purge away from the body and using a cloth wrap around the wand tip during purging reduces aerosol travel. This is a low-cost control, but it depends on consistent habit and requires training and supervision to embed reliably — verbal instruction alone does not achieve it.
• Forearm protection: Purpose-made heat-resistant forearm sleeves designed for barista use are available and provide a meaningful physical barrier against steam contact. These must be kept dry and clean; damp fabric transmits heat more efficiently than dry fabric and a wet sleeve offers reduced protection. Cotton long sleeves worn habitually are better than nothing but are not a substitute for purpose-designed protection.
• Skin barrier maintenance: Workers should apply a high-quality emollient or barrier cream before shifts and again after washing. This does not prevent thermal injury but it maintains the integrity of the skin barrier, which affects how quickly damage accumulates and how effectively the skin repairs between shifts. Fragrance-free formulations are preferred to avoid additional sensitisation in skin that is already under stress.
• What does not work well: Short-sleeved uniforms with no arm protection, or reliance solely on the worker's personal awareness to avoid splashback, are not adequate controls. Most splashback events happen too quickly for deliberate avoidance to be reliable.

What a Worker Should Do If Already Affected

A barista who already has persistent skin changes on the forearms should not continue working through them without seeking assessment. The practical steps are: report the skin changes to a supervisor or employer formally, in writing if possible, so that the report is documented; request referral to an occupational health practitioner who can examine the skin and determine whether the changes are consistent with erythema ab igne or another occupational skin condition; see a general practitioner or dermatologist if the changes include any raised, rough, or non-healing area — these require clinical examination to exclude pre-malignant change.

Time off work alone does not reverse structural skin change in the later stages. Early-stage changes — where the reddening still fades during rest days — can stabilise and partially resolve if exposure is reduced promptly. Changes that have become fixed do not reverse, though they can be monitored and further progression can be slowed.

A worker should not accept 'it is just a burn scar' as a complete answer. The pattern of reticulated pigmentation on both forearms in a barista is a recognised occupational presentation and deserves proper documentation and follow-up.

What People Commonly Get Wrong About This Hazard

The most common misunderstanding is confusing cumulative thermal injury with a single-event burn. Because no individual steam event causes a serious acute injury, baristas and managers alike often conclude that the steam wand is only a minor hazard. The clinical reality is that the cumulative effect of hundreds of thousands of micro-exposures over years is a distinct and recognised pathological process — erythema ab igne — that would not be produced by any single event, however severe.

A second common error is treating the skin changes as purely cosmetic. In the early stages they may appear so, but the underlying mechanism involves progressive dermal change that carries long-term implications for skin integrity and, in a small proportion of cases, cellular health.

A third misunderstanding is that protective sleeves are too hot to wear in a cafe environment. Modern heat-resistant forearm sleeves designed for kitchen and barista use are significantly lighter and more breathable than industrial equivalents. The discomfort of wearing them is real but manageable, and it is substantially less than the long-term consequence of not wearing them.

Health at Work supports employers and workers in identifying and managing occupational skin hazards across all sectors. If a barista in your team has raised concerns about skin changes on their forearms, or if you want to review your thermal hazard controls for coffee bar operations, a structured occupational health assessment is the right starting point.