Supplementary Material for: Atrophic pityriasis versicolor: three case reports.

Introduction: Pityriasis versicolor is a common epidermal mycotic infection well-known in its classic hypo- or hyperpigmented macular form. However, its atrophic variant, first described in 1971, remains rare and poorly documented. The underlying cause of this variant has yet to be determined. Case presentation: We report three cases of patients treated with topical steroids for inflammatory skin diseases (atopic dermatitis, cutaneous scleroderma, and mycosis fungoides) who developed erythematous and squamous atrophic lesions on their back during follow-up. Complete resolution of both patches and atrophy was observed following the discontinuation of topical steroids and the onset of topical and systemic antifungal therapy. Conclusion: Atrophic pityriasis versicolor is a disease which deserves to be highlighted to prevent misdiagnosis with other severe dermatological conditions also presenting with skin atrophy, as to avoid lesions worsening due to inappropriate treatment.