Does anyone know some information about merkel cell cancer?

Rare type skin tumor: Merkel cell carcinoma (mcc) is an unusual and highly aggressive skin cancer and often appears in the elderly population. More than one half of all mccs occur on the head and neck. Mcc has a high propensity for local recurrence, as well as spread to distant sites. For more info check wikipedia which seems to have a fairly good section on this tumor.

Skin cancer: Merkel cell cancer is a malignancy that comes from cells in the skin related to neural components. It is usually on the head and neck but can occur anywhere. The treatment is surgery, wide excision with sentinel node biopsy since mcc can spread to lymph nodes. Radiation therapy is sometimes given to the area around the lymph nodes. It's cause is unknown.