A dermatologist is a doctor who specializes in conditions involving the skin, hair, and nails. A dermatologist can identify and treat more than 3, 000 conditions. These conditions include eczema, psoriasis, and skin cancer, among many others. With over 2500 different skin diseases, Dermatology is an interesting specialty ranging from skin cancer through to anti-ageing treatments. It is highly specialised and often needs an expert eye with extra years of study to make a diagnosis as many diseases can manifest on the skin.