Metastatic squamous cell carcinoma arising from a serious widespread porokeratotic eccrine ostial and dermal duct nevus: Case report and literature review

Porokeratotic eccrine ostial and dermal duct nevus (PEODDN) is a rare benign skin disease. Widespread involvement of PEODDN is more uncommon and its association with squamous cell carcinoma (SCC) is also rare. In this case report, we present the case of a 50-year-old woman with serious widespread PEODDN along Blaschko's lines and concomitant invasive SCC with lymph node metastasis. This was the first reported case of metastatic SCC arising from PEODDN.