body or skin problem?

[lois788]

Hello, good afternoon. I wanted to believe if you can guide me a bit if it is a problem of the body or the mesh?
 It is with the only skin that does not get erect I am using atomic muscle 

thanks partners

[kurdwolf]

Skeleton problem

[lois788]

Muchas gracias por orientarme está tarde trato de resolverlo 

Thank you very much for guiding me this afternoon I try to solve it