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.
Mustard Gas. Mustard Gas (Yperite) was first used by the German Army in September 1917. It was one of the most lethal of all the poisonous chemicals used during the war. It was almost odourless and took twelve hours to take effect.