Bullous pemphigoid (BP) is an acquired autoimmune blistering disease in which autoantibodies against epitopes in the basement membrane zone of the skin such as BP180 or BP230 are produced. Dipeptidyl peptidase (DPP)-4 inhibitors have become commonly used to treat diabetes. As DPP-4 inhibitors are more commonly prescribed for diabetes, BP related to DPP-4 inhibitors has been reported and has attracted attention. Therefore, we retrospectively investigated patients who were diagnosed with BP in order to examine characteristics of DPP-4 inhibitor-related BP (nine patients; median age, 85 years) in comparison with non-DPP-4 inhibitor-related BP (21; median age, 85 years). There was no significant difference in Bullous Pemphigoid Disease Area Index between DPP-4 inhibitor-related BP patients and non-DPP-4 inhibitor-related BP patients, except for erosions/blisters score in mucosa. Laboratory tests revealed no significant differences between DPP-4 inhibitor-related BP patients and non-DPP-4 inhibitor-related BP patients in total white blood cell count, eosinophil count, neutrophil count and the titer of anti-BP180 antibody. The number of eosinophils infiltrating into the skin was significantly lower in patients with DPP4 inhibitor-related BP than in patients with non-DPP4 inhibitor-related BP. Our results showed that DPP-4 inhibitor-related BP has some distinct pathological characteristics from BP not associated with DPP-4 inhibitor.

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The association of psoriasis with thyroid dysfunction has been investigated; however, it remains controversial. Some papers indicate it, and others do not. Thereby, we investigated the prevalence of thyroid dysfunction in patients with psoriasis vulgaris (PsV), psoriatic arthritis (PsA) and generalized pustular psoriasis (GPP), and the relationship between the severity of psoriasis with serum free triiodothyronine (fT3), free thyroxine (fT4) and thyroid-stimulating hormone levels. Data on 85 psoriatic patients visiting our hospital from January 2015 to November 2017 (54 men and 31 women; 51 PsV, 23 PsA 23 and 11 GPP) were retrospectively analyzed. Fourteen percent of psoriatic patients had thyroid dysfunction. The percentage of patients with thyroid dysfunction was the highest in those with GPP (45% GPP, 13% PsA, 8% PsV). Patients with thyroid dysfunction demonstrated significantly higher Psoriasis Area and Severity Index scores and elevated serum C-reactive protein (CRP) levels than those without thyroid dysfunction. A significant negative correlation was observed between the serum levels of CRP and fT3 (P = 0.0032, r = À0.4635). Our data indicate that thyroid dysfunction in patients with psoriasis is associated with inflammation caused by psoriasis.

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Generalized pustular psoriasis (GPP) is a systemic inflammatory disease that presents with erythema and sterile pustules, pathologically characterized by Kogoj's spongiform pustules. GPP is sometimes accompanied by mucosal involvement, and the most common lesion is on the tongue. IL36RN mutation was found to contribute to the pathogenesis of GPP especially in patients who develop GPP without a past medical history of psoriasis vulgaris. The association of IL36RN mutation with mucosal involvement in GPP is controversial. We herein report a 60‐year‐old male GPP patient with no past history of plaque psoriasis presenting with not only severe skin lesions and arthritis but also severe mucosal involvements of pharyngeal and gastrointestinal lesions, which led to gastrointestinal bleeding. Our case did not have any mutation in the IL36RN gene. We should be aware that severe GPP can cause gastrointestinal bleeding. The relevancy of IL36RN mutation with mucosal involvement in GPP remains to be elucidated.