Fresh aloe can also help speed healing. You can drink aloe juice, which is also a bit of a laxative. If you're putting it directly on your bum, I'd recommend getting a plant and splitting and applying the fresh aloe (no preservatives, no lemon, etc), though I have used Badger after-sun aloe in a pinch. I have seen fresh aloe leaves at the grocery store if you have no plant. I have also found zinc to be helpful in protecting and healing that tissue. Different things work at different times for different people. Wish there was a straight up cure!!
PS: Those prep-H products make mine worse.