A carcinoma with apocrine and less often eccrine differentiation, arising from the sweat glands. It usually presents as a solitary slow growing nodule in the dermis or subcutaneous tissues. It is characterized by a nodular growth pattern and it is often associated with necrotic changes. The disease is hidradenocarcinoma (MONDO_0006245, a Monarch Disease Ontology identifier). Also known as: clear cell eccrine carcinoma.