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Original Article

Chronic actinic dermatitis — A study of clinical features

Vijay K. Somani
Director, Somani Skin & Cosmetology Institute, Hyderabad, Andhra Pradesh, India.

Address for correspondence: Dr. V K Somani, #17-A, Journalist Colony, Jubilee Hills, Hyderabad, Andhra Pradesh-500 033, India. E-mail:
vksomani@rediffmail.com

ABSTRACT

Background: Chronic actinic dermatitis (CAD), one of the immune mediated photo-dermatoses, comprises a spectrum
of conditions including persistent light reactivity, photosensitive eczema and actinic reticuloid. Diagnostic criteria
were laid down about 20 years back, but clinical features are the mainstay in diagnosis. In addition to extreme sensitivity
to UVB, UVA and/or visible light, about three quarters of patients exhibit contact sensitivity to several allergens, which
may contribute to the etiopathogenesis of CAD. This study was undertaken to examine the clinical features of CAD in
India and to evaluate the relevance of patch testing and photo-aggravation testing in the diagnosis of CAD. Methods:
The clinical data of nine patients with CAD were analyzed. Histopathology, patch testing and photo-aggravation testing
were also performed. Results: All the patients were males. The average age of onset was 57 years. The first episode
was usually noticed in the beginning of summer. Later the disease gradually tended to be perennial, without any
seasonal variations. The areas affected were mainly the photo-exposed areas in all patients, and the back in three
patients. Erythroderma was the presenting feature in two patients. The palms and soles were involved in five patients.
Patch testing was positive in seven of nine patients. Conclusions: The diagnosis of CAD mainly depended upon the
history and clinical features. The incidence of erythroderma and palmoplantar eczema was high in our series. Occupation
seems to play a role in the etiopathogenesis of CAD.

Key Words: Chronic actinic dermatitis, Clinical features

INTRODUCTION 3. Reduction in the minimal erythema dose (MED) to

both UVB and UVA.
Chronic actinic dermatitis (CAD), an immune mediated
photodermatosis, comprises of persistent light Allergic contact dermatitis (ACD) commonly coexists
reactivity, actinic reticuloid, photosensitive eczema and with C AD, of ten preceding the onset of any
photosensitivity dermatitis. These conditions were photosensitivity,[3] reactivity to one or more allergens
originally defined based on the following three criteria occurring in 75% of CAD patients. Sesquiterpene lactone
twenty years ago.[1,2] extracts from Compositae plants are implicated most
1. A persistent eczematous eruption of infiltrated commonly, but contact allergy to fragrances, colophony,
papules and plaques, that predominantly affects rubber and sunscreens are also frequently seen in CAD
exposed skin, sometimes extending to covered patients.
areas.
2. Histopathology consistent with chronic eczema with CAD predominantly affects sun-exposed sites but
or without lymphoma like changes, and shaded areas may also be affected. Involvement of

How to cite this article: Somani VK. Chronic actinic dermatitis — A study of clinical features. Indian J Dermatol Venereol Leprol 2005;71:409-
13.
Received: February, 2005. Accepted: July, 2005. Source of Support: Nil. Conflict of interest: None declared.

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Somani VK: Chronic actinic dermatitis

shaded sites, e.g., eyelids, may point to an associated reactions were graded as negative (-), doubtful positive
ACD. Eczematous patches, which later become (+/-) when there was erythema but no palpable rash,
confluent, occur on exposed areas like back of the hands, positive (+) when there was a clear palpable erythema,
face, scalp, neck, etc. Progression to erythroderma has and strong positive (++) when the reaction was beyond
been reported. The palms and soles may show the chamber margins.
eczematous changes. Since facilities for photo-testing
or photopatch testing are not freely available and since The MED to both UVA and UVB could not be assessed
the histopathology is non-specific, the clinical features as all the patients had type V skin in the Fitzpatrick
remain the most important tool in the diagnosis of classification. Patch testing was performed to common
CAD. contact allergens, especially fragrances, rubber,
colophony, sunscreens and the Compositae group of
This study was undertaken to examine the clinical plants, to confirm any associated contact sensitivity.
features of CAD in India and to evaluate the relevance
of patch testing and photo-aggravation testing in the Photo-aggravation testing: The patients were exposed
diagnosis of CAD. to NB-UVB in Daavlin whole body chamber, in a serially
increasing dosage starting from 80 mJ. The test was
METHODS done thrice weekly with a 10% increment at every
subsequent visit. The dosage at which the rash
We conducted this study at Hyderabad and nine cases worsened was noted. After about 2 weeks of strict
of CAD seen over a period of ten months (April 2004 avoidance of sunlight, and use of antihistamines and
to January 2005) were selected for the study. The emollients, when the rash relatively subsided, patients
diagnosis was suggested by: a) the typical eczematous were exposed to UVA in serially increasing doses starting
eruption over the exposed areas, b) histological features from 0.5 J/cm2, with 0.5 J increments at every visit.
of dermatitis, and c) history of extreme sensitivity to Testing was done thrice weekly.
solar radiation. Investigations like anti-nuclear
antibodies, anti-SSA, anti-SSB antibodies, examination RESULT S
of urine/feces for porphyrin determination, complete
blood count, blood urea, liver function tests, IgE levels All the nine patients in our study were men, with ages
and HIV (ELISA) tests were done in all the cases. Patients ranging from 37 years to 78 years. The mean age of
with other photosensitivity dermatoses were excluded. onset was 47.5 years (range, 36 years to 63 years). The
Skin biopsy, photo-testing and patch testing were done duration of the disease ranged from 1 year to 20 years
in all the cases. and the mean duration was 9.5 years [Table 1]. All the
patients in our series were involved in occupations
Patch test: Patch tests were done with the Indian that involved outdoor work.
Standard battery, as approved by the Contact and
Occupational Dermatoses Forum of India (CODFI), and Clinical features: Pruritus was a feature in all the patients.
supplied by M/s Systopic Laboratories. Additionally, two It was quite severe and often interfered with the
sunscreen lotions were used for patch testing, and in patients’ sleep pattern. In the initial stages, the rash
one patient, streptomycin solution (since he gave a used to appear during summer only, but later the
history of administering streptomycin injections daily seasonal variation disappeared and the eruption became
for about 13 years). Patch test units containing severe and perennial. The rash first appeared on the
aluminium chambers were used. The allergens were face [Figure 1] in all but one patient, who gave a history
placed in the chambers and the units were applied to of forearm involvement before the face was affected.
the backs of the patients. The patches were removed The mid-forehead was spared in all patients initially.
after 48 hours (day 2), and read after 30 minutes. A But later, especially in erythrodermic patients and in
second reading was taken after 96 hours (day 4). The advanced stages, this feature was gradually obliterated.

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Somani VK: Chronic actinic dermatitis

The rash later spread to other exposed areas like the of UVB responsible for aggravation of the dermatitis
hands, forearms, scalp [Figure 2], ears, ‘V’ area of the ranged from 97 mJ to 305 mJ and UVA ranged from 3.5
neck, back of the neck, etc. Two patients presented to 6.5 J/cm2 [Table 3].
with erythroderma. Three patients had severe, recurrent
hand eczema involving the dorsal aspect of the terminal The treatment taken in the past was symptomatic and
phalanges. Three patients also showed involvement of included avoidance of sunlight, sunscreens,
palms [Figure 3] and two had palmoplantar involvement antihistamines and topical steroids. One patient [Table
with dry patchy hyperkeratotic eczema. 1, patient 4] was started on azathioprine 100 mg daily
for 8 weeks. It was discontinued after the dermatitis
Histopathology showed an eczematous picture with settled. After 3 months the patient again experienced
spongiosis, acanthosis and a dermal, predominantly a relapse.
perivascular lymphocytic infiltrate and hyperkeratosis
in chronic stages. On patch testing, 7 out of 9 patients DISCUSSION
showed positive reactions to one or more contact
allergens [Table 2]. Eight out of 9 patients experienced Chronic actinic dermatitis is characterized by a
worsening of the rash on photo-testing. Five tested persistent eczematous eruption, occasionally associated
positive to UVB, 3 to both UVB and UVA. The dosage with infiltrated papules and plaques predominantly
affecting exposed skin and to a lesser extent, covered
skin, in response to UVR and rarely to visible light. It
usually affects the middle aged or elderly, with
approximately 90% of patients being male.[4] A new

Table 1: Clinical features

Sr. Age of patients Duration of the disease

(in years) (in years)
1 53 8
2 56 8
3 78 15
4 68 20
5 49 3
6 37 1
7 54 9
8 59 10
9 60 12
Figure 1: Typical chronic actinic dermatitis facies

Figure 2: Subacute eczematous changes over the scalp Figure 3: Palmar eczema in chronic actinic dermatitis

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Somani VK: Chronic actinic dermatitis

Table 2: Correlation of patch test with clinical features of skin creases, the upper eyelids, the area under the
Case Allergen Grade Unusual areas involved
earlobe, nose and the lower lip, under the chin, and
1 Potassium dichromate, ++ Feet, palms, the finger webs. Flexural involvement is seen frequently
parthenium, ++ soles, upper eyelids in ABCD in contrast to CAD.
rubber mix +/-
2 Colophony, + Dorsal fingers, palms
parthenium +/- In our series two patients had erythroderma, five
3 Colophony ++ Erythroderma, palms
Balsam of Peru, + patients showed palmar/palmoplantar eczema and three
parthenium +/- had frank ACD involving the dorsal fingers. The
4 Nickel sulfate, + Upper eyelids, dorsal
thiuram mix, + fingers incidence of these associated features was quite high
parthenium, ++ in our study population.
sunscreen +
5 Para-phenylenediamine + Dorsal fingers, palms
(PPD), ++ The mid-forehead was spared in all our patients initially.
nickel sulfate
6 Nil Palms, soles The reason for this could be linked to the anatomy of
7 Nickel sulfate, rubber mix ++ that area; the lateral forehead is comparatively bossed,
8 Parthenium ++ Erythroderma
9 Nil getting more exposed to radiation initially than the
central mildly depressed area. This could be akin to
Table 3: Results of photo-testing the involvement of the lateral forehead in many Indians
Case Dose at which rash worsened with seborrheic melanosis rather than the central
UVA NB UVB partially “protected” mid-forehead. Later, as the disease
1 4J 10 7mJ
2 3.5 J 209 mJ progresses, this feature is obliterated as the amount of
3 - 118 mJ UV radiation sufficient to cause dermatitis reaches the
4 6.5 J 305 mJ
5 - 172 mJ optimum in the mid-forehead.
6 - 130 mJ
7 - -
8 - 97 mJ The histological and immunohistochemical features of
9 - 118 mJ CAD, along with increased ICAM-1 expression mimic
subgroup affecting young men and women with persistent ACD. [9,10] The dermal infiltrate consists
associated atopic dermatitis has been identified.[5-8] This predominantly of T lymphocytes with a trend towards
variant was previously thought to be photo-aggravated lower CD4+/CD8+ ratios in patients with more florid
atopic dermatitis. histology, again features seen in persistent and
pseudolymphomatous forms of ACD.
CAD can mimic very closely air-borne contact dermatitis
(ABCD), photo-aggravated ACD, atopic dermatitis or CAD may also represent a T cell mediated disease that
drug photosensitivity. Increased IgE or family or personal begins as photoallergic dermatitis. An interesting
histor y of atopy, onset at an early age, would theory[3] proposes that during the initial localized
differentiate atopic dermatitis from CAD. Drug photoallergic reaction, a normal skin constituent is
photosensitivity is generally linked to an inducing altered to become antigenic. The induction of a local
substance and the eruption is generally not eczematous. response begins with UVA dependent covalent binding
In photo-aggravated contact allergy, there may be a of hapten to an endogenous protein, and is followed
history of contact and the rash beginning in an area by an eczematous delayed type hypersensitivity
with a localized eczematous response followed by response. As the disease progresses to CAD, UVB +
photo-aggravation, mimicking CAD. Clinically ABCD UVA alone may trigger the immune response at any
mimics CAD most closely. In ABCD generally the whole site, without the hapten, by continuing formation of
face is involved, whereas in CAD there is usually sparing antigenic photoproduct from the omnipresent

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Somani VK: Chronic actinic dermatitis

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