If you have a wound and you want to make Wudu, there is nothing wrong with you leaving the bandage on; rather you have to leave it on because it is in your interests. You can wipe over the outside of it when you wash the part of your hand that is not covered.

A woman does not have to undo her hair when she does Ghusl following Janabah (impurity following sexual discharge), but she must make sure that the water reaches all parts of her body, including the hair and its roots.