The Essential Role of IL-17 as the Pathogenetic Link between Psoriasis and Metabolic-Associated Fatty Liver Disease.

Interleukin 17 (IL-17) is an effector cytokine that plays a key role in the pathogenesis of both psoriasis and metabolic-associated fatty liver disease (MAFLD), a condition that is more prevalent and severe in patients with psoriasis. In liver inflammation, IL-17 is mainly produced by CD4+ T (TH17) and CD8+ T cells (Tc17), although numerous other cells (macrophages, natural killer cells, neutrophils and Tγδ cells) also contribute to the production of IL-17. In hepatocytes, IL-17 mediates systemic inflammation and the recruitment of inflammatory cells to the liver, and it is also implicated in the development of fibrosis and insulin resistance. IL-17 levels have been correlated with progression from MAFLD to steatohepatitis, cirrhosis, and even hepatocellular carcinoma. Clinical trials have shown that inhibiting IL-17A in patients with psoriasis could potentially contribute to the improvement of metabolic and liver parameters. A better understanding of the key factors involved in the pathogenesis of these chronic inflammatory processes could potentially lead to more efficient treatment for both psoriasis and MAFLD, and help to develop holistic strategies to improve the management of these patients.

Prevalence of cutaneous findings in Spanish neonates and relationships to obstetric and parental factors.

Two hundred forty-seven healthy newborns were investigated in a prospective cohort descriptive study. Information on phenotype and obstetric and parental history was collected. A positive association was found between erythema toxicum neonatorum and season of birth (spring and summer), whereas parental history of any skin disease was related to a lower frequency of this eruption.

Facial self-induced paraffinoma in an elderly woman.

A 72-year-old Caucasian woman without remarkable medical history presented with an asymptomatic bilateral periocular swelling, which had been present for 2 months. Physical examination showed symmetric indurated periocular erythematous plaques (Figure 1). Biopsy of a skin lesion revealed aggregates of vacuoles of different sizes (Figure 2) surrounded by a prominent inflammatory infiltrate constituted by macrophages, lymphocytes, neutrophils, and granulomatous foreign body reaction throughout the reticular dermis and hypodermis. These histological findings were consistent with the injection of an oily foreign substance. The patient denied the self-induced nature of the lesions, so she was referred for psychiatric evaluation and admitted having self-injected mineral oil as an impulsive attempt to get attention from her family. She was diagnosed with borderline personality disorder (BPD) and started treatment with oral fluoxetine, showing a rapid decrease of impulsive behavior and anxiety from the second week with a mean dose of 80 mg/d.

Mastocitosis sistémica con hiperpigmentación cutánea difusa / Systemic mastocytosis: An unusual etiology for cutaneous hyperpigmentation

Presentamos un caso de mastocitosis sistémica que mostraba una importante y progresiva hiperpigmentación melánica cutánea a lo largo de los últimos 8 años. La llamativa hiperpigmentación cutánea de nuestro paciente podía estar en relación con factores estimuladores del desarrollo de mastocitos y melanocitos (AU)

Citrobacter koseri in scalp folliculitis.

Gram-negative folliculitis, an uncommon condition, is most often seen in older patients who have acne and who either have received prolonged courses of antibiotic therapy or have used antibacterial cleansers that selectively inhibit gram-positive organisms. Citrobacter infections are uncommon, and dermatologists seldom encounter them. In the past, these infections occurred in hospitals, particularly in neonatal intensive care units. Bacteremias also occur in elderly or immunocompromised patients. In this article, we present a case of Citrobacter koseri scalp folliculitis in an otherwise healthy patient.