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.
What is skin cancer? People get cancer when some cells in the body are damaged and start growing way too fast. These growing cells make spots or bumps called tumors. Nobody knows why some people get cancer and others don't. Lots of different things can cause cancer and sometimes doctors don't know what causes it. But they do know for sure that the sun is one of the things that causes skin cancer.