Health condition
Chronic actinic dermatitis
Chronic actinic dermatitis is a persistent eczema of light-exposed skin - face, neck, backs of hands - in which the immune system reacts to even small doses of sunlight; it mainly affects older men and is confirmed by phototesting.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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Chronic, itchy, thickened eczema sharply limited to sun-exposed sites, often sparing skin creases, behind the ears and under the chin
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Symptoms persist year-round and can be triggered through window glass; many patients also have contact allergies (notably to plants)
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Phototesting shows abnormal sensitivity to UVB, often UVA and sometimes visible light; patch and photopatch testing complete the workup
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Management: rigorous photoprotection, potent topical steroids and tacrolimus, with azathioprine, ciclosporin or mycophenolate for severe disease
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
What looks like stubborn facial and hand eczema is, in chronic actinic dermatitis, a delayed-type immune reaction against skin proteins altered by light - so the disease smoulders through winter, flares with trivial exposure, and in severe cases confines people indoors with blackout measures. The sharp cut-offs at collar and cuff lines, with sparing of shaded folds, are the visual signature.
Diagnosis and treatment routes
Referral to a photodermatology unit allows monochromator phototesting to quantify light sensitivity and patch/photopatch testing to identify compounding contact allergens such as sesquiterpene lactones from Compositae plants. Treatment layers dense UV-protective clothing and broad-spectrum (including visible-light) sunscreens with anti-inflammatory topicals; systemic immunosuppression and carefully supervised low-dose PUVA desensitisation manage the severe end of the spectrum. In much of the UK, a routine NHS referral to the relevant specialist clinic can take several months, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a dermatologist with access to photodiagnostic testing. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Chronic actinic dermatitis.
Quick, plain-English answers to what people ask us most.
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What is chronic actinic dermatitis?
Chronic actinic dermatitis is a persistent, eczema-like skin condition caused by an abnormal immune reaction to sunlight, even to relatively low levels of UV exposure that would not affect most people. It most commonly affects older men and tends to involve sun-exposed areas such as the face, neck and hands, though it can spread more widely. It is a chronic condition requiring long-term management of light exposure and skin inflammation.
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What causes chronic actinic dermatitis?
The exact underlying mechanism is not fully understood, but it involves an abnormal, exaggerated immune response to ultraviolet (and sometimes visible) light. It can sometimes develop after a period of contact allergy to certain substances such as plants or fragrances, which appears to sensitise the skin to subsequently react abnormally to light as well. Certain medications can also increase photosensitivity and potentially contribute in some cases.
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What symptoms does it cause?
Symptoms include red, thickened, intensely itchy skin resembling eczema, predominantly in sun-exposed areas such as the face, neck, and back of the hands, though severe cases can extend to normally covered skin too. Symptoms are typically worse in summer with greater sun exposure, though some people have persistent symptoms year-round. It can significantly affect quality of life given the visible and uncomfortable nature of symptoms.
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Is chronic actinic dermatitis serious?
It is not life-threatening, but it can be a significantly distressing and disabling condition due to its chronic, visible nature and the degree of sun avoidance often needed to manage it, which can affect daily activities and quality of life considerably. With appropriate specialist treatment, most people achieve meaningful symptom control. Long-term management typically requires an ongoing partnership with a dermatologist.
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How is chronic actinic dermatitis treated?
Treatment includes strict sun protection (high-factor broad-spectrum sunscreen, protective clothing, and minimising direct sun exposure), topical steroid or other anti-inflammatory creams for flares, and, for more severe cases, systemic immunosuppressive treatments or specific light therapy desensitisation programmes under specialist supervision. Identifying and avoiding any specific triggering substance, if found through patch testing, is also important. Treatment is usually managed by a dermatologist with experience in photosensitivity conditions.
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Can chronic actinic dermatitis be cured?
It cannot always be fully cured, but many people achieve good long-term control with consistent sun protection and appropriate treatment, and some people see the condition improve or resolve over years. Ongoing specialist follow-up helps adjust treatment as needed. The overall goal is to allow as normal a quality of life as possible despite the underlying light sensitivity.
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When should I see a specialist?
See a dermatologist if you have persistent, itchy skin changes particularly affecting sun-exposed areas, especially if worse in summer. NHS dermatology referral can take several weeks; a private dermatology consultation is typically available within about 2 weeks for earlier specialist assessment, including patch testing if relevant.