1. The arm is a person's arm, and the "right hand man" is a person's best helper. The arm injury seems to symbolize that you have some entanglements or injuries with the people who need your help the most or the people who need your help the most?
2. Water generally symbolizes emotion. Does this entanglement or injury seem emotional?
Asking for help seems to mean that you need others' support and help now?
Taking off the skin of the upper body like undressing reminds me of "painted skin", which may be the best protection to protect us from harm. Taking off your skin seems to indicate that you feel exposed. Did you get hurt because you didn't keep some secrets or privacy?
After wearing it, the skin is still wrinkled, obviously unsightly and does not fit, which may symbolize that you don't know yourself well enough?
Maybe you should continue this dream and tell yourself in it that I have the ability to heal my wounds and forgive those who hurt me.
The above explanation just gives you some reference and inspiration. I am my best dream interpreter. Only in a detailed dream can I have a practical explanation.
Good luck!