Can Ultrasound Examinations Generate Pain in Hidradenitis Suppurativa Patients? Results from a Multicentric Cross-Sectional Study.

Background: Pain is not a trivial issue for hidradenitis suppurativa (HS) patients and has been considered a domain in the Core Outcome Set. To date, there is no evidence about pain caused by the ultrasound examinations.

Objective: The aim of the study was to assess the presence of pain generated by the ultrasound examinations of HS patients.

[Chilean clinical guideline for the management of hidradenitis suppurativa - executive summary].

Hidradenitis suppurativa is a chronic inflammatory disease of the hair follicle characterized by recurrent painful and inflamed lesions, predominantly affecting intertriginous regions. Due to its physical sequelae and impact on quality of life, we should be familiarized with this disease to make an appropriate diagnosis and implement an early treatment. This executive summary of the clinical guideline, elaborated by the hidradenitis suppurativa workgroup of the Chilean Society of Dermatology and Venereology (SOCHIDERM), reviews its definition, epidemiology, pathophysiology, risk factors, comorbidities, psycho-emotional impact, clinical presentation, diagnosis, classifications, ultrasonographic evaluation, and its medical and surgical treatments.

Ultrasonographic Criteria for Diagnosing Unilateral and Bilateral Retronychia.

Objectives: To assess the main characteristics of retronychia on ultrasonography (US) and to propose US criteria for diagnosing unilateral and bilateral cases according to the digit.

Methods: We conducted a case-control study with retrospective, descriptive, and statistical analyses of the US images of 210 nails: 43 with retronychia and 167 normal nails. The Student t test, Fisher exact test, and Kruskal-Wallis test, among other tests, were performed.

[Subcutaneous granuloma annulare: a case report].

Unlabelled: Granuloma annulare is a benign and self-limited cutaneous disease. Subcutaneous granuloma annulare is an uncommon variant seen almost exclusively in young children, characterized by firm nodules appearing more frequently in lower extremities, buttocks, hands and scalp.

Objective: To report a case of subcutaneous granuloma annulare and review its differential diagnoses and treatments.

[Linear IgA bullous dermatosis of childhood: case report].

Linear IgA bullous dermatosis is a rare acquired autoinmune vesiculobullous disease characterized by linear IgA deposit on the dermo-epidermal basement membrane observed with direct inmunofluorescence. The characteristic lesions are vesicles and tense serous bullae, which most often are grouped giving a "cluster of jewels" appearance. Differential diagnosis must be established with other autoimmune dermatosis, such as dermatitis herpetiformis and bullous pemphigoid.