Who is the fattest hamster?

The world's fattest hamster was a Syrian hamster named Speedy, who weighed 2.7 kilograms (6 pounds) and was owned by a woman in South Yorkshire, England. Unfortunately, Speedy passed away in 2011.

Can a female hamster have babies by her self?
What would cause your hamster to lose hair on his nose and have sores around mouth- The only thing I know for sure is that he chews the bars of cage pretty much all time?