Hair disorders induced by external factors

Abstract

External factors may result in hair loss, increased hair growth, or changes in the color and texture of the hair. External factors responsible for hair loss are drugs, radiation, traction, fungi, pesticides, plant toxins, heavy metals and several other chemicals. Several groups of drugs may be responsible for unintentional induction of hair growth. Texture and color of hair may be changed by drugs, metals, and ultraviolet and other radiation. Full recovery is the rule after elimination of the responsible factor.