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Simple Summary: The aim of this study is to compare the risk of local recurrence and metastases in patients with cSCC based on the presence or absence of prior sun exposure in the region of tumor development. A retrospective observational epidemiological study including 558 patients from January 2017 to December 2020 was conducted. Among the 463 patients with cSCC in highly sun-exposed areas, 73 (15.8%) were diagnosed with local recurrence versus only 7 of 95 patients (7.4%) in less sun-exposed areas. No differences were found in terms of metastasis between both groups. In regions with low sun exposure, the variables linked to a heightened risk of recurrence include tumor depth and the involvement of surgical margins. Our results suggest that highly sun-exposed areas could have a greater risk of developing local recurrence, conferring a worse prognosis for the patients. Background: The incidence of cutaneous squamous cell carcinoma (cSCC) is increasing over the years. Risk factors for local recurrence and metastasis have been widely studied in highly sun-exposed areas of the body but less data exist about less sun-exposed ones. The main objective of this study is to compare the risk of local recurrence and metastases in patients with cSCC in highly sun-exposed areas compared to cSCC in less sun-exposed areas. Material and methods: A retrospective observational study was carried out, including 558 patients with histopathologically confirmed cSCC at the Reina Sofía University Hospital (HURS), Córdoba, during the period from 1 January 2017 to 31 December 2020. Demographic, clinical and anatomopathological data were collected. Results: Local recurrence occurs more often in highly sun-exposed areas (15.8%) compared to less sun-exposed ones (7.4%) (p < 0.05). However, no differences in the rate of metastases in both groups were found. The presence of affected surgical margins and tumor thickness were identified as independent risk factors for cSCC in low sun-exposure areas. Conclusions: cSCC located in anatomical areas of high sun exposure presented a greater risk of developing local recurrence in our population, which could suggest that these tumors have worse prognosis than those that lie in areas that do not receive chronic sun exposure. [ABSTRACT FROM AUTHOR]

This article discusses the successful treatment of epidermal nevus (EN) in a patient with phacomatosis spilosebacea (PSS) using topical sirolimus. EN is a type of birthmark, while PSS is a rare disorder characterized by the presence of EN along with other organ system involvement. Treatment of EN can be challenging, but topical sirolimus has shown promising results in managing difficult-to-treat dermatological disorders. In this case, a patient with PSS experienced a marked decrease in thickness of the EN lesions after 5 weeks of treatment with topical sirolimus, with no adverse effects reported. Further follow-up is needed to confirm the long-term improvement. [Extracted from the article]

The appearance of morphea after vaccination has been reported to date as single and deep lesions that appear exactly at the site of the skin puncture. It was therefore postulated that the origin could be the trauma related to the injection. The aim of this article is to review the various hypotheses offered in the published literature about generalized morphea following vaccination. We present two cases of generalized morphea after COVID‐19 vaccination and review the published literature on immune‐related cutaneous reactions. As previously reported, antigenic cross‐reactivity between vaccine spike proteins and human tissues could cause certain immune‐mediated diseases, including generalized morphea. Herein we report two cases of generalized morphea probably induced by the COVID‐19 vaccine, given the temporal relationship with its administration. In summary, environmental factors such as vaccination against SARS‐COV‐2 could induce an immune system dysregulation, which would have an important role in the pathogenesis of morphea. We present two cases of generalized morphea probably induced by the COVID‐19 vaccine, given the time elapsed between vaccination and the onset of the skin lesions. [ABSTRACT FROM AUTHOR]

Juvenile xanthogranuloma (JXG) is a non-Langerhans cell histiocytosis usually occurring in infants and typically located in the head or neck.1 Clinically, solitary skin lesions are found in 60%-82% of patients and the most common variant is characterized by one yellowish nodule. Further studies are needed to help determine the efficacy and safety of this treatment in non-spontaneously resolved JXG and in other non-Langerhans cell histiocytoses limited to the skin, in which it could also be an alternative. In this respect, it is worthy of mention that characteristic histopathological clues of JXG as presence of xanthomatous/foamy histiocytes or Touton cells were not observed in any case.10 As noted above, spontaneous resolution of adult onset JXG is uncommon, and an area of atrophy frequently develops. [Extracted from the article]