Can I use mupirocin ointment for diaper rash?
No. Only if it has become infected by bacteria.
Can mupirocin heal or help with eczema?
Only if the eczema has become bacterially infected. Otherwise, it would be considered a inflammatory skin condition, not a bacterial skin infection.
Can mupirocin be used for athletes foot?
No. You would need an antifungal cream, mupirocin is an antibacterial cream.
Is it safe to put on an open wound?
The polyethylene glycol in Bactroban can be absorbed by the body from open wounds (and damaged skin) and therefore it is not recommended you use Bactroban cream on an open wound.