Final answer:
A single lesion is an isolated area of abnormal skin caused by conditions such as contact dermatitis, infections, or inflammation (e.g., acne or folliculitis). Lesions can also result from serious diseases like skin cancer due to DNA damage from UV radiation exposure. Recognizing diverse lesion types aids in diagnosing and treating skin disorders.
Step-by-step explanation:
A single lesion in dermatology refers to an isolated area of abnormal skin, which can be a result of various medical conditions. Common causes of skin lesions include contact dermatitis, where the skin reacts to exposure to irritants such as latex, or delayed-type hypersensitivity reactions like the tuberculin test response. Additionally, lesions may arise from infections such as folliculitis or inflammatory conditions like acne, where hair follicles become inflamed due to blockage with lipids, fatty acids, and skin cells, creating a breeding ground for bacteria.Skin cancer, a serious disease where abnormal cells divide uncontrollably, can also lead to cancerous lesions. The increase in skin cancer incidence has been linked to factors such as the degradation of the ozone layer and subsequent UV radiation overexposure, which damages DNA within skin cells. Although the body's melanin provides some degree of protection, it may not be sufficient, and skin cancer can form even on areas not typically exposed to sunlight. Understanding the characteristics and causes of skin lesions is essential for diagnosing and treating various skin diseases and disorders.