Poroma is skin cancer that arises from the sweat gland cells. Its diagnosis could be difficult. Line‐field optical coherence tomography (LC‐OCT) is a novel imaging technique that has shown promise in the diagnosis and monitoring of various skin conditions. We report a case of poroma diagnosed by LC‐OCT.

A case of recurrence of pyoderma gangrenosum after COVID-19 vaccineDear Editor, Pyoderma gangrenosum (PG) is a rare neutrophilic inflammatory skin condition characterized by painful purulent pustules or enlarging ulcers with raised, undermined and violaceous borders. PG has been associated with various systemic diseases, such as inflammatory bowel disease, monoclonal gammopathy, hematologic disease, inflammatory arthritis, malignancy and hidradenitis suppurativa. 1 There have been several reported cases of occurrences and recurrences of PG after COVID-19 infection and vaccination. In this case report, we describe a patient with a history of PG, which had been in remission for several years prior to vaccination that experienced a recurrence of PG at the same sites as the previous involvement.

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