Review of idiopathic photodermatitis at dermatology tertiary centre, Hospital Kuala Lumpur

ABSTRACT

Introduction: Photodermatitis had become more common reason for referral to dermatology clinics. In Southeast Asia, research regarding idiopathic photodermatitis is not well established. Photo and photo-patch tests are commonly used diagnostic investigations to support this diagnosis. Objective: To describe the epidemiological and clinical features of idiopathic photodermatitis referred for photo and photo-patch tests. Methods: This retrospective study reviewed the clinical data of patients with idiopathic photodermatitis who were referred for photo and photo-patch tests from January 2009 to July 2011. Patients’ demographics, spectrum of clinical presentations, results of photo and photo-patch tests and clinical outcome were reviewed. Results: 38 patients were included in the analysis. Majority of patients were males. The mean age was 47.2 years. 55.3% were Malays, 26.3% Chinese and 18.4% Indians. Most patients have Fitzpatrick’s skin type IV. The commonest clinical presentations were polymorphic eruptions consisted of erythematous patches, papules and eczema at the sun-exposed areas. On average, the patients have had the cutaneous eruption for more than 1 year prior to the initial clinic visit. 32 patients had photo test and 6 had photo and photo-patch tests. 56.3% had positive photo test and the lowest MED is 50mJ/cm2 in skin type IV. 20% had positive photo and photo-patch tests. Patients were treated with potent topical corticosteroid, physical sunblock and oral antihistamines which managed to control the disease severity. Conclusion: Most patients with idiopathic photodermatitis referred for photo test were middle-aged Malay males with skin type IV. The commonest cutaneous presentations were polymorphic eruptions at the sun exposed sites.