Corrosive

Everything I touch falls apart.
I eat away at it until all that's left are gaping, painful sores.
I'm a pretty poison, people like to touch me.
I will burn them, and burn them deep.
Bottle me up and put me away somewhere dark and safe.
Tattoo me with a warning, paint me black like my soul.
Lock me up and throw away the key.
Beautiful on the outside, but seething with liquid destruction on the inside.
Don't open me up, you'll be sorry.