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Byline: Chun-Yu. Cheng, Chuang-Wei. Wang, Fang-Ying. Wang, Wen-Hung. ChungSir,Symmetrical drug-related intertriginous and flexural exanthema is a drug-induced eruption characterized by symmetrical distribution of well-demarcated erythema of the inguinal, gluteal and [...]

Neutrophilic eccrine hidradenitis (NEH) usually manifests as asymptomatic or painful infiltrated erythematous papules or plaques of variable sizes. It is characterized by dense neutrophilic infiltration and necrosis of the eccrine secretory coils in histopathology. The condition is most commonly reported in patients with hematologic malignancy, who have been undergoing chemotherapy. Direct drug toxicity to the eccrine glands has been proposed to be the cause of NEH. Although several drugs have been reported to induce NEH, the tyrosine kinase inhibitors have only rarely been identified as culprits in the literature. Here, we present a case of pazopanib-related NEH in a patient with uterine adenocarcinoma, in which NEH recurred after the reintroduction of pazopanib. To the best of our knowledge, this is the first report of a case of pazopanib-related NEH. [ABSTRACT FROM AUTHOR]

Acquired perforating calcific collagenosis (APCC), which is characterized by the calcification of dermal collagen fibers with subsequent transepidermal elimination and perforation, is an extremely rare entity. Thus far, it has only been reported in a patient with direct contact exposure to calcium chloride. Here, we report a unique case of APCC occurring in a drug addict admitted for rhabdomyolysis. The present case is a 20‐year‐old male patient hospitalized for drug‐related rhabdomyolysis and multiple organ damage. During hospitalization, he gradually developed unusual skin rashes. There were multiple confluent umbilicated and keratotic erythematous to brownish papules and plaques with scratch‐like linear plaques on his lower abdomen, inguinal areas and gluteal sulci. Also, multiple well‐demarcated flesh‐colored rough, hard and thin plaques with a "crepe paper"‐like texture were found on the bilateral popliteal fossae, olecranon fossae and axillae. The histopathology of two biopsied lesions demonstrated acquired perforating calcific collagenosis. The lesions appeared during the rhabdomyolysis‐related hypercalcemia phase and resolved spontaneously after the calcium level returned to normal. This is the first reported case of disseminated APCC occurring during transient hypercalcemia due to rhabdomyolysis. [ABSTRACT FROM AUTHOR]