What are the possible causes of large white spots on fish and how can they be treated effectively?

Large white spots on fish can be caused by various factors such as fungal infections, parasitic infestations, or bacterial infections. To effectively treat these white spots, it is important to first identify the underlying cause. Treatment options may include medicated baths, anti-fungal or anti-parasitic medications, or antibiotics. It is recommended to consult a veterinarian or a fish health specialist for proper diagnosis and treatment.