Not them cheap cloth ones people walk round in.
The reason they are saying don't touch your eyes or face is that this virus can be contracted from more than the mouth.
Masks may be helpfull for close quarter contact, but generally walking down the street with one on will do nothing much but make you feel safer.
The instruction we have been given at work is to wear gloves as we have contact with many public used areas and surfaces l and change them after each task.
I’ve said before, my Line Manager at work was senior in the NHS prior and has said the normal surgical masks will do nothing.