There are a variety of skin conditions that cause people to seek the services of a dermatologic surgeon, but the most common causes are: Aging and its effects on appearance, such as lines and wrinkles, brown spots and resistant fat deposits. Skin damage from sun exposure, such as benign and malignant growths and tumors, broken capillaries, lines and pigmentation problems. Diseases and disorders of the skin such as skin cancer, acne, moles, birthmarks and rashes. Other diseases that visibly affect the skin, such as diabetes, HIV, hormonal imbalances and internal cancer. Trauma – injury and accidents that can cause relatively minor wounds and scars to more serious disfiguration. Genetic factors with skin manifestations – inherited tendencies toward certain disorders such as hair loss, varicose veins, dark shadows under the eyes and resistant fat deposits.