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.
Other causes of hair loss, especially if it is in an unusual pattern, include: 1  Alopecia areata (bald patches on the scalp, beard, and, possibly, eyebrows; eyelashes may fall out). 2  Anemia. 3  Autoimmune conditions such as lupus. 4  Burns. Certain infectious diseases such as syphilis.  Excessive shampooing and blow- 1 drying. Hormone changes.  Thyroid diseases.