Background:
Topical treatments for koi ulcers and body sores have ranged from Iodine in the olden days, to potassium permanganate rubs and even more recently, hydrogen peroxide. These have one thing in common: They excoriate or burn the adjacent tissues.

• Panolog – Antibacterial and anti-inflammatory, helps healing. Can work alone.
  
• Tincture of Iodine – cauterizes, applied directly, stains badly. Very effective. 7% best
  
• Hydrogen Peroxide – Elegant! Very effective, no staining, cauterizes, antibacterial, safe.
  
• Potassium permanganate – caustic, stains, antibacterial cauterizer.
  
• Mercurachrome – Stains for a very long time, safe for humans, effective, good choice. Do not scrub.
  

Healing Koi Ulcers and How You Can Screw It Up

• Folks, only treat meat-red, bloody koi ulcers
  
• Don't treat pink wounds directly.
  
• Do not scrub if koi ulcer is tidy and neat.
  
• When the koi ulcer is pink with white rim – LEAVE IT ALONE
  
• Do not scrub healing koi ulcers
  

There is little doubt that the average hobbyist would be best served to combine MediKoi medicated food and antibacterial bath together to recover their koi. Not only are the treatments effective, they are also cost effective.