The problem behind this question is not knowing exactly HOW you lost the weight. If you went for Lipo, then realistically you could have had them remove the fat from wherever you wanted.
However, if you had lost 50lbs from doing nothing but situps, your facial fat is less likely to have been affected, as well as any fat on your backside.
Your nose would not likely have any exra fat on it to begin with, since it is formed of cartilage, and does not directly get affected by the weight gain in the first place.
So, basically, it all depends on how exactly you went about the weight loss that would affect where the weight got dropped.