A chemical burn occurs when living tissue is exposed to a corrosive substance such as a strong acid or base.
An acid is a molecule or ion capable of donating a hydron, or, alternatively, capable of forming a covalent bond with an electron pair.
A burn is a type of injury to skin, or other tissues, caused by heat, cold, electricity, chemicals, friction, or radiation.
A corrosive substance is one that will destroy and damage other substances with which it comes into contact.
First Aid : How to Treat a Chemical Burn by ehowhealth
Chemical burns follow standard burn classification and may cause extensive tissue damage.
A chemical substance is a form of matter that has constant chemical composition and characteristic properties.
Fake Jeffree Star &ABH Liquid Lipsticks Causing Chemical Burn?! by Karina Kaboom
The main types of irritant and reducing agents, solvents, and alkylants.
A solvent is a substance that dissolves a solute, resulting in a solution.
Additionally, chemical burns can be caused by some types of chemical weapons, e.g., vesicants such as mustard gas and Lewisite, or urticants such as phosgene oxime.
Nettle agents or urticants are a variety of chemical warfare agent that produces corrosive skin and tissue injury upon contact, resulting in erythema, urticaria, intense itching, and a hive-like rash.
Sulfur mustard, commonly known as mustard gas, is a cytotoxic and vesicant chemical warfare agent with the ability to form large blisters on exposed skin and in the lungs.
A blister agent, or vesicant, is a chemical compound that causes severe skin, eye and mucosal pain and irritation.
Chemical burns may:
need no source of heat,
occur immediately on contact,
not be immediately evident or noticeable,
be extremely painful,
diffuse into tissue and damage structures under skin without immediately apparent damage to skin surface.