The human body contains many natural polymers, such as proteins and nucleic acids. Cellulose, another natural polymer, is the main structural component of plants. Most natural polymers are condensation polymers, and in their formation from monomers water is a by-product.
Alopecia areata is one type of hair loss that typically causes patches of baldness. In some cases, total baldness develops. In many cases, the hair re-grows, typically after several months. In some cases, the hair loss is permanent.
Alopecia areata is a recurrent nonscarring type of hair loss that can affect any hair-bearing area and can manifest in many different patterns. Although it is a benign condition and most patients are asymptomatic, it can cause emotional and psychosocial distress. See the images below. Patchy alopecia areata.