A trichologist is a medical professional who specialises in hair and scalp health, while a dermatologist is a medical professional who specialises in skin and hair health. While both can diagnose and treat hair and scalp conditions, trichologists have a more specific focus on hair and scalp health. They have specialised training in hair loss conditions and hair treatments, such as PRP for hair, GFC for hair, and QR 678 Hair Growth Treatment.