Complete visualization of lesions is critical for the accurate diagnosis and management of dermatological diseases. Currently, the most readily available technologies used by dermatologists include dermoscopy and photography. Nevertheless, ultrasound has emerged as a useful non-invasive modality in dermatology, which can be added to the clinical examination supporting an early and more accurate diagnosis. Moreover, there are significant technological advances in recent years, such as the development of handheld devices and ultra-high frequency probes that have expanded the integration of ultrasound into daily dermatology practice. In this article, we reviewed the most common applications of ultrasound in the field of dermatology.

<b><i>Background:</i></b> Several studies report a high prevalence of inflammatory arthritis among hidradenitis suppurativa (HS) patients. <b><i>Objectives:</i></b> To study the association between HS and inflammatory arthritis. <b><i>Methods:</i></b> The systematic review and meta-analysis were performed according to the PRISMA guidelines to identify the association between HS and inflammatory arthritis, spondyloarthritis, ankylosing spondylitis (AS), and rheumatoid arthritis (RA). <b><i>Results:</i></b> Seven studies were entered in the analysis, with 200,361 HS patients and 385,599 controls. Pooled analysis illustrated a significantly increased risk of inflammatory arthritis in HS patients compared to controls (odds ratio [OR] 3.44; 95% confidence interval [CI] 1.92–6.17). There was also a statistically significant association between HS and spondyloarthritis (OR 2.10; 95% CI 1.40–3.15), and between HS and AS (OR 1.89; 95% CI 1.14–3.12). Moreover, pooled analysis showed a statistically significant association between HS and RA (OR 1.96; 95% CI 1.28–2.98). <b><i>Conclusions:</i></b> Our findings show that HS patients have a 3-fold increased risk of developing inflammatory arthritis. HS patients are specifically at a higher risk for spondyloarthritis, its subtype AS, and RA.

<b><i>Background:</i></b> Mycosis fungoides (MF) and Sézary syndrome (SS) are the most common subtypes of cutaneous T-cell lymphoma (CTCL). There is currently no cure for CTCL, and treatment is aimed at limiting disease progression. This study evaluated the efficacy and tolerability of alitretinoin in CTCL management. <b><i>Methods:</i></b> A retrospective, multicenter study was conducted on CTCL patients treated with alitretinoin as a primary agent or in combination with standard therapies. <b><i>Results:</i></b> Forty-eight patients with MF (<i>n</i> = 40) and SS (<i>n</i> = 8) with a median age of 59.7 years (±14.3) were eligible for study inclusion. Treatment response data were evaluated in 40 patients and safety in 42 patients. 40.0% of the patients had early-stage, 43.8% had advanced-stage CTCL, and in 16.7% of patients there was insufficient information for staging. 40.0% (16/40) of the patients achieved a complete or partial response, whereas 47.5% (19/40) achieved stable disease, 12.5% (5/40) had progressive disease, and there were no cases of disease relapses in responders. Both early and advanced stages of CTCL were responsive to alitretinoin as a primary or combined modality. Alitretinoin was well tolerated, and 64.3% (27/42) of patients did not report any side effects. The most commonly observed side effect was hypertriglyceridemia. <b><i>Conclusions:</i></b> This retrospective analysis supports the efficacy and safety of alitretinoin in clearing skin disease and preventing disease progression in CTCL as a monotherapy or in combination with standard therapies.

Hidradenitis suppurativa (HS) is a disorder of follicular occlusion characterized by recurrent painful inflammatory nodules, sinus tracts, and abscesses. 1 It typically develops after puberty and more frequently involves women, younger adults, and people with darker skin. 1 While the exact etiology of HS is unknown, immune dysfunction and multiple extrinsic factors, such as smoking and obesity, have been suggested to contribute to its development. 2 Down syndrome (DS) is among the most common chromosomal disorders, resulting from trisomy of chromosome 21. Individuals with DS are often affected by congenital heart defects, endocrinologic disorders, and immunologic impairments. 3 A number of cutaneous disorders have also been associated with DS, including atopic dermatitis, alopecia areata, and folliculitis. 4

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