Character entity references can also have the format &name; where name is a case-sensitive alphanumeric string. For example, Î» can also be encoded as &lambda; in an HTML document. The character entity references &lt; , &gt; , &quot; and &amp; are predefined in HTML and SGML, because, ,  and & are already used to delimit markup. This notably does not include XML's &apos; (') entity.
Lack of facial expression. Lack of facial expression: Introduction. An absence of expression on the face is medically called flat affect. In many cases, the face mirrors the underlying emotions, and the person has limited emotions or various emotional or psychological disorders.
Facial lipoatrophy is the loss of fat beneath the skin, which can result in sunken cheeks, indentations, and hollow eyes. Lipoatrophy is common among HIV patients. Sculptra is a synthetic and biocompatible material that is injected below the surface of the skin in the area of fat loss.