A Case of Porocarcinoma From Pre‐existing Hidroacanthoma Simplex: Need of Early Excision for Hidroacanthoma Simplex?

Background. Hidroacanthoma simplex (HAS) is an uncommon eccrine neoplasm of the skin. It is a benign neoplasm, but some cases of malignant change were reported in the literature. Objective. To describe a rare case of porocarcinoma in a relatively short period from pre‐existing HAS on the abdomen. Methods. Wide local excision was performed on this neoplasm. Results. There was no recurrence for 72 months after wide excision. Conclusion. We recommend an early excision and careful attention in the case of HAS because of its potential malignant change.