According to Bacall, in her autobiography "By Myself", during the filming of "Dark Passage", Bogart's hair began to fall out in clumps, the result of alopecia areata, although photos from their 1945 wedding show Bogart to be losing his hair two years earlier. By the end of filming he wore a full wig. Bogart eventually had B12 shots and other treatments to counteract the effects, but he was helped by the fact that in his next film, "The Treasure of the Sierra Madre" he was required to wear a full wig.