Moon face is a medical sign in which the face develops a rounded appearance due to fat deposits on the sides of the face. It is often associated with Cushing's syndrome or steroid treatment , which has led to it being known as Cushingoid facies.Cushing's syndrome is a collection of signs and symptoms due to prolonged exposure to glucocorticoids such as cortisol. Signs and symptoms may include high blood pressure, abdominal obesity but with thin arms and legs, reddish stretch marks, a round red face, a fat lump between the shoulders, weak muscles, weak bones, acne, and fragile skin that heals poorly.Women may have more hair and irregular menstruation. Occasionally there may be changes in mood, headaches, and a chronic feeling of tiredness. Cushing's syndrome was first described by American neurosurgeon Harvey Cushing in 1932. Cushing's syndrome may also occur in other animals including cats, dogs, and horses.

More Info: en.m.wikipedia.org