ACMT Toxicology Visual Pearl: Not Very A-peel-ing

Which of the following chemicals, commonly used in chemical peels, can cause severe, gray colored skin burns upon direct contact?
- Acetone
- Hydrogen peroxide
- Phenol
- Salicylic acid
[Author’s own image]

Which of the following chemicals, commonly used in chemical peels, can cause severe, gray colored skin burns upon direct contact?
[Author’s own image]
Chronic exposure to which substance can cause this finding on a Cervical Spine MRI?