“Parry-Romberg syndrome is also known as progressive facial hemiatrophy. It is a condition that starts in childhood and usually affects half of the face. In rare cases, both sides of the face are affected.The signs and symptoms of Parry-Romberg are very different from person to person and range from mild to severe. The most common symptom is the thinning or shrinkage (atrophy) of the skin, soft tissues, and in some cases muscle, cartilage and bone.”

Boston Children’s Hospital