Final answer:
A lesion is a mark on the skin signifying damage or injury, leading to structural changes in tissues or organs. Injuries to the skin are varied, including burns, scars, and stretch marks, often due to external pressures or trauma. Scarification is also a form of skin marking that may signify cultural or group affiliation.
Step-by-step explanation:
A lesion is any mark on the skin that may indicate an injury or damage that changes the structure of tissues or organs. The skin, being the most external part of our bodies, is especially susceptible to various types of injuries such as burns, wounds, scars, and calluses. These can be a result of sharp objects, excessive heat, or pressure and friction against the skin.
Injuries to the skin also cover conditions like stretch marks, which are formed when the skin is stretched rapidly during events such as growth spurts or pregnancy, leading to expansion of the dermis beyond its elastic limits. Other skin afflictions may include bedsores, a result of prolonged pressure due to immobility, and scarification, a deliberate form of marking the skin common in certain cultures and subcultures.