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.
Skin tumors are abnormal growths of tissue that can be malignant (cancerous) or benign (harmless). Skin tumors become extremely common as people get older. Some common benign tumors include: Warts (skin tumor resulting from a virus) Seborrheic keratoses (growths on the skin ranging from light skin color to dark brown)