A Case of Multiple Piloleiomyoma on the Shoulder, which is Mistaken for Keloid

In the cases of a papule or nodule emerging from the skin at the shoulder, with signs of itching or pain among the Asian populations, we suspect the lesion to be a keloid. This is because children used to be inoculated with Bacillus Calmette-Guérin in the shoulder. Itching and pain are sensations that are commonly felt by patients who have keloids. A previous study reported that 86% of the patients experienced itching, and 46% felt pain [1]. Leiomyoma, on the other hand, is a rare benign tumor that appears in either solitary or multiple patterns. However, cutaneous leiomyomas may look clinically similar to keloids and other benign cutaneous neoplasms, therefore a diagnosis can only be confirmed by examining the characteristic histology of the lesion. We report the case of a patient who came to our hospital because his symptoms were not improving after treatment at another hospital, where he had been misdiagnosed as having a keloid.