Real-life effectiveness of narrowband UVB phototherapy for pityriasis lichenoides.

Dear Editor, Pityriasis lichenoides (PL) is an inflammatory skin disease of unknown etiology. The clinical spectrum of pityriasis lichenoides encompasses febrile ulcer-necrotic Mucha-Habermann disease (FUMHD), pityriasis lichenoides et varioliformis acuta (PLEVA), and pityriasis lichenoides chronica (PLC). Phototherapy is an effective and well-tolerated modality that is often successful for persistent PL or resistant to topical treatments. [...].