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 classic Steve McQueen movie immortalised three tunnels at Stalag Luft III PoW camp, now astonished archaeologists have discovered a fourth called George. It has lain hidden for nearly 70 years and looks, to the untrained eye, like a building site.