Back in the late 80s, I had a 13" Volitan lionfish that was used to being hand fed & it, one day when I was stupid & not paying attention, stuck two poison-filled dorsal spines into me. Got sooooo bad, I was yelling at my brother to cut off my right arm when the poison moved up towards my shoulder/chest. Luckily, PoisonControl told me to soak it under hot water (I used almost boiling water) to denature the poison/enzyme/proteins before they caused permanent damage to my internal organs. Ended up with nasty burns but nothing I couldn't live with.
Yeah, lionfish are beautiful but deadly. Luckily for you, it was JUST a dwarf
Anthony