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Radiotherapy's main skin toxicities are now well-separated, acute (acute radiation dermatitis) or chronic complications (chronic radiation dermatitis, induced cutaneous carcinoma, aesthetic sequelae). Exceptionally, radiotherapy may induce, by isomorphic reaction or Koebner's phenomenon, some specific dermatosis. In this article, we report five new observations of these unusual complications of radiation therapy, occurring in very variable time after breast irradiation and remaining strictly localized in the irradiated field (cutaneous mastocytosis, Sweet syndrome, lichen planus, vitiligo). These cases emphasize the need to realize a systematic histological exam if any atypical skin lesion appears after radiotherapy, even long after., (Copyright © 2017 Société française de radiothérapie oncologique (SFRO). Published by Elsevier SAS. All rights reserved.)

Lichen planus is a heterogeneous chronic inflammatory dermatosis occurring in middle-aged adults. It can affect the skin, mucous membranes and dander. The pathophysiology involves an immune reaction mediated by T lymphocytes, which attack the basal keratinocytes inducing their apoptosis. Dermoscopy is a non-invasive examination allowing the visualization of structures, invisible to the naked eye, located at the epidermis, the dermo-epidermal junction and the dermis. In this article we describe the dermoscopic aspects of lichen planus and its topographic variants. [ABSTRACT FROM AUTHOR]

Frontal fibrosing alopecia (FFA), a form of lichen planopilaris (LPP), is primary cicatricial alopecia commonly affecting postmenopausal women. For the first time, we investigated the diagnosis of FFA and LPP in patients presenting with the chief complaint of facial papules and roughness. This cross-sectional was performed among 68 patients with facial papules. We described the epidemiology, comorbidities, clinical presentations, and the association between facial papules and LPP or FFA. All the patients were female with a mean age of 47.84 years. Scalp alopecia was observed in all the patients presenting with facial papules, of which 89.7% had FFA. Five patients were diagnosed with LPP without FFA. Most of the patients were premenopausal (73.5%), and 70.6% had grade I FFA. Concomitant cutaneous lichen planus involvement was observed more frequently than mucosal involvement. The most frequent comorbidities were hypothyroidism, dyslipidemia, and hypertension. History of alopecia areata was detected in 8.8% of the patients. Androgenetic alopecia (AGA) was present in 17 patients (25%). Facial papules are the silent and early signs of FFA and LPP. Paying attention to these early signs along with metabolic disturbances can help with the early diagnosis of the disease, especially among premenopausal women. [ABSTRACT FROM AUTHOR]