Dermatology is the study of the skin, including its structure, function, common diseases, and their treatments. This field covers how the skin works as a barrier and sense organ, what skin disorders look like, and how they’re managed with medical or therapeutic approaches. In a salon or spa setting, this knowledge helps you assess skin health, choose appropriate products and procedures, recognize signs that require medical referral, and apply infection-control practices safely because you understand where and how skin infections or conditions could spread. Dermatopathology is focused on examining skin tissue under a microscope to diagnose diseases, not on treating or guiding general skincare. Cosmetology centers on beauty services and cosmetic care, not the medical aspects of skin. Pathology studies disease processes in the body more broadly, not specifically the skin or its treatment.