Parathyroid hormone (PTH) is released by the parathyroid glands. The four tiny parathyroid glands are located in the neck, near or attached to the back side of the thyroid gland. PTH controls calcium, phosphorus, and vitamin D levels in the blood. It is important for regulating bone growth.
What is skin cancer? Skin cancer is a broad term that refers to any type of cancer that begins in the cells of the skin. These cancers usually develop in the top layer of skin, also known as the epidermis. The most common types of skin cancer are basal cell carcinoma, squamous cell carcinoma and melanoma. In addition, there are several types of skin cancers that occur much less frequently, including kaposi sarcoma, merkel cell carcinoma, cutaneous (skin) lymphoma, skin adnexal tumors and various types of sarcomas.
Melanoma is a type of skin cancer, the other main types being basal cell carcinoma and squamous cell carcinoma. Melanoma is the most aggressive of the skin cancers. Melanoma is a cancer of skin cells called melanocytes, which produce the pigment in moles, freckles and tanned skin. Melanomas can occur anywhere on the skin, but are most common on the chest and back in men, and the legs in women. The head and neck are other common sites.