Bruising and Bleeding. Bruising or bleeding after an injury is normal. However, some people have disorders that cause them to bruise or bleed too easily. Sometimes people bleed without any obvious triggering event or injury.
The skin of victims of mustard gas blistered, the eyes became very sore and they began to vomit. Mustard gas caused internal and external bleeding and attacked the bronchial tubes, stripping off the mucous membrane. This was extremely painful and most soldiers had to be strapped to their beds.
Phosgene In an attempt to find an antidote to phosgene, a toxic gas used as a weapon during World War I, Nazi doctors exposed 52 concentration-camp prisoners to the gas at Fort Ney near Strasbourg, France. Phosgene gas causes extreme irritation to the lungs.