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A pilomatrixoma is a slow-growing, noncancerous skin tumor of the hair follicle. It's most common on the face and neck, and it's more common in children and young adults. Read on to learn more.

Keratitis is an inflammation or infection of the cornea of the eye. The cornea is the clear, dome-shaped surface that covers the front of the eye.

Achondroplasia is a group of rare genetic (inherited) bone disorders. Achondroplasia is the most common type of what was once called dwarfism, in which the child's arms and legs are short in proportion to body length.

Puberty that happens early is called precocious puberty. Gonadotropin-independent precocious puberty is caused by early secretion of high levels of sex hormones. These include the male androgens and female estrogens.

Hypoparathyroidism is when the parathyroid glands don’t make enough parathyroid hormone. The parathyroid glands are four tiny glands on the thyroid. The hormone they make helps manage levels of calcium in the bloodstream. Low levels of the hormone leads to low levels of calcium. This can lead to muscle spasms and cramping, called tetany.

Hypoglycemia is when the level of sugar (glucose) in the blood is too low. Hypoglycemia can be a condition by itself. Or it can be a complication of diabetes or other disorder. Read on to learn more.

Hypopituitarism means that the pituitary gland is not working normally. The pituitary gland is a pea-sized gland located at the base of the brain. It’s the master endocrine gland in the body. The pituitary gland normally releases as many as 8 different hormones. These hormones control growth, metabolism, blood pressure, and other body processes. The effects of hypopituitarism may be slow over time. Or they may be sudden.

Juvenile dermatomyositis (JDM) is a rare disease that causes muscle inflammation and a skin rash.

IgA Vasculitis is a condition that involves swelling (inflammation) of small blood vessels. The swollen blood vessels leak into the skin, joints, intestines, and kidneys.