Causes: It is caused by yeast called Malassezia, which normally exist in small numbers on the skin. Certain conditions however, can cause the overgrowth of the yeast, causing the development of white and reddish-brown spots on skin.
The 3 men all escaped and made it back to the Britain.   The Great Escape shown in the film happened in March 1944 having been planned first in January 1943. It consisted as per the film of 3 tunnels Tom Dick and Harry, Tom being discovered by the Gestapo.
The three men were the only prisoners to successfully escape from the camp's eastern compound. The Great Escape: With the opening of the camp's northern compound in April 1943, many of the British prisoners were moved to new quarters. Among those transferred were Bushell and the majority of the X Organization.