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Hi. Welcome to Just Answer. My name is***** I'm sorry to hear about this situation with your guy. How long ago did this stepping on the cactus happen? Did your vet evaluate him for this and then prescribe the antibiotic ointment?
So he stepped on the cactus about a month ago and draining sores are still present?
That honestly is the best thing that you can do. There may be some residual cactus in the original puncture area(s) that is serving as a persistent foreign body that is getting infected and not resolving.