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.
The gases used to such effect in World War One were still potential weapons in World War Two. Mustard gas had been used by the Italians in their campaign in Abyssinia from 1935 to 1936. Chlorine was a potential weapon but it had been overtaken in effectiveness by diphosgene and carbonyl chloride. Both of these were choking gases that damaged the respiratory system.