Dr Bryan McDonald is a consultant dermatologist at the Royal London Hospital, where he conducts both adult and paediatric dermatology clinics. He specialises in treating a wide range of skin disorders, including complex inflammatory skin diseases such as acne vulgaris, psoriasis, eczema, and hidradenitis suppurativa. Dr McDonald also offers skin cancer assessments and performs skin surgery. He sees private patients at OneWelbeck Dermatology and Spire London East Hospital.

As the paediatric dermatology lead at the Royal London Hospital, Dr McDonald has established a new hidradenitis suppurativa/complex acne service. He also leads a male genital dermatology service at both the Royal London Hospital and Watford General Hospital. Dr McDonald earned his MB BCh in 2000 from Queen's University of Belfast, initially training as a general practitioner before specialising in dermatology.

Dr McDonald is the honorary secretary of the British Association of Dermatologists and a member of several professional committees, including the British Association of Dermatologists Therapeutics and Guidelines Committee. He is also the chair of the British Association of Dermatologists medicines access sub-committee. His professional memberships include the Royal College of Physicians of London, the British Society of Medical Dermatologists, and the British Society of Paediatric Dermatology, among others.