Lichen planus (LP) is a chronic-relapsing inflammatory skin disease. Although many drugs have been used for the management of LP, some of them lack the backup by strong therapeutic evidence, while others are not suitable for some patients due to safety profile issues. The aim of this study was to review the recent status of available medical therapies for LP to help physicians make better decisions upon best medical practice while facing patients with this condition. A review of published articles on management of LP was conducted with the MEDLINE and PubMed databases. The quality of the evidence was graded as high, moderate, low or very low. A total of 1366 articles were retrieved, and 219 (16%) were included in the final analysis. Twenty-one different treatment modalities were analysed. The quality of evidence was high for topical steroid and calcineurin inhibitor, while it was moderate for oral steroids. All the other modalities reached low or very low quality of evidence. Topical steroids and calcineurin inhibitors are the current first-line therapies, while for other therapies the strength of recommendation is not so evident. Unfortunately, larger randomized, controlled trials to support the efficacy, safety and tolerability of other therapies in LP are lacking, and many of them are recommended based on studies with small sample sizes, lack of standardized outcome measures or lack of controlled duration or even in anecdotal evidence. Thus, large-scale randomized clinical trials are still warranted to establish the exact benefits of other topical treatments, phototherapy, immunosuppressant and new immunomodulators for an optimized treatment of LP.

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Summary Background Hidradenitis suppurativa (HS), also referred to as acne inversa, is a debilitating skin disease characterized by inflammatory nodules, chronic abscesses and tunnels (fistulae and sinuses). The association with pilonidal sinus disease (PSD) is frequently reported but not well documented. Objectives To determine the prevalence and characteristics of inflammatory skin lesions located in the intergluteal fold (IGF) of patients with HS. Methods This was an international multicentre retrospective cross‐sectional study based on data collection from a large cohort of patients with HS with and without histopathology. Results From a total of 2465 patients with HS included in the study, 661 (27%) reported lesions in the IGF. These patients were significantly more often smokers and had more severe HS. Of the 238 patients with an available clinical diagnosis, intergluteal‐HS (IG‐HS) was diagnosed in 52 patients (22%) and PSD was diagnosed in 186 patients (78%). IG‐HS was associated with the localization of HS in the proximity of the IGF, including the buttocks, genitals and the anus. There was a possibility of misclassification bias in this study as a clinical/image‐based diagnosis or histopathology of the IGF lesions was not always available. Conclusions The high prevalence of PSD suggests a strong link between both entities. Therefore, it may be useful to identify common pathophysiological mechanisms and develop common therapeutic strategies. What's already known about this topic? The occurrence of pilonidal sinus disease has not been clearly reported among patients with hidradenitis suppurativa/acne inversa. What does this study add? This is the first study that investigated the prevalence of pilonidal sinus disease among a large cohort of patients and identified the patient characteristics. Risk factors that might help to improve the management of patients were identified.

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