Specialist doctors are medical professionals who focus on a specific area of medicine. They have advanced training and expertise in diagnosing and treating particular health conditions. Examples of specialist doctors include cardiologists, who deal with heart issues, and dermatologists, who focus on skin problems. These doctors often work in hospitals or private practices and may collaborate with primary care physicians to provide comprehensive patient care. Patients are usually referred to specialist doctors when their health issues require more detailed attention than a general practitioner can provide.