<unk> s are rare tumors that in two large review studies represented 0.0058% and 0.134% of all skin tumors; dermal duct tumors are the rarest form of the<unk> s, representing only 3.3% of these tumors in 3 studies examining 675 poroid neoplasms. They usually occur in the elderly population (mean age 65.1–66.6 in different studies) as small (<2 centimeters), solitary dome-shaped papules, plaques, or nodules, that are skin-colored, pink, red, white, or blue and range from smooth to wart-like, ulcerative, or pyogenic granuloma-like lesions. They may be located on the palms of the hands, soles of the feet, trunk, face, neck, or other cutaneous surfaces such as the areola, nipple, or other areas of the breast, on the scrotum, or on the vulva. Rarely, individuals present with multiple<unk> s either in one or widespread areas; these cases are termed<unk> tosis.<unk> s present more commonly in: pregnancy; patients treated with electron therapy for mycosis fungoides; sites of chronic radiation dermatitis caused by long-term radiation exposure; patients who received chemotherapy with or with radiation therapy (these patients have often presented with<unk> tosis); individuals with underlying skin conditions such as hypohidrotic ectodermal dysplasia and Bowen’s disease (i.e. a form of squamous cell carcinoma that is localized to the outermost layer of the skin); and skin plaques of individuals with the congenital disease, nevus sebaceous.<unk> s are usually slow growing and asymptomatic but some individuals report that their lesions are itchy, mildly tender, or painful. An existing<unk>  that develops spontaneous bleeding, ulceration, sudden itching, pain, or rapid growth over a short period of time may indicate that it has become a cancerous<unk> rcinoma. These cancers may metastasize to local lymph nodes, nearby or distal skin sites, bones, bladder, breast, retroperitoneum, ovary, liver, lung, brain, or stomach. However. the progression of a<unk>  to a<unk> rcinoma is very rare, i.e. less than 1% of cases.
Poroma
Theca lutein cyst
Blastoma
Porocarcinoma
Teratoma
Hidradenocarcinoma
Corpus luteum cyst
Nabothian cyst