Do you recommend frequently washing your dog to help with their skin condition?
It depends on the skin condition. For environmental allergies it may be helpful to wash regularly to reduce the contact of allergens (e.g. pollen) with the skin, especially during the hotter seasons and when exposure has been high, such as after having taken your dog for a walk in a bushy area. Be careful to use the correct shampoos as recommended by your vet to avoid stripping the skin and coat of protective fatty acids. Use cool water and don’t blow dry with hot air. For food allergies, regular washing is not necessary.
As long as the skin is healthy there should be no need for regular bathing.