Split open your torso with a knife? Got crushed between a hydraulic airlock?
Walk it off, worst case you lose some blood.
Got a welding torch to the face? Massive scarring from touching a live wire?
You're back to 100% in no time.
Ate something bad and now your belly aches?
Your body will NEVER, EVER stop hurting until you get medicine.
If there's any damage type that shouldn't heal it should be burn damage, which is a little lackluster currently
I think it'd make sense for your liver to constantly remove toxin damage, but incur damage to itself at the same time. The liver would then heal itself at half the rate at which it removes toxins from you.
So minor toxin damage would be no problem, and even major toxin damage could be healed by yourself, but having too much toxin damage at once would cause your liver to kill itself trying to heal it.
Great, now I have toxin damage AND liver failure.
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I think it'd make sense for your liver to constantly remove toxin damage, but incur damage to itself at the same time. The liver would then heal itself at half the rate at which it removes toxins from you.
So minor toxin damage would be no problem, and even major toxin damage could be healed by yourself, but having too much toxin damage at once would cause your liver to kill itself trying to heal it.