PTH controls calcium and phosphorus levels in the blood. PTH is made by the parathyroid glands, which are four pea-sized glands that lie behind the thyroid gland. If the blood calcium level is too low, the parathyroid glands release more PTH.
Skin cancer is a cancer of the cells in the outermost layer of skin, called the epidermis. The epidermis itself has three layers: an upper and middle layer made up of squamous cells, and a bottom layer made up of melanocytes and basal cells.
Melanoma is an aggressive and deadly form of skin cancer. Skin cancer from sun and tanning beds is claiming more and younger victims each year. Many who have been diagnosed with skin cancer wish that they had some training to look for skin cancer or to avoid those activities that increase its risk.