Doctors advise only those attending to patients like docs and nurses should wear masks and also those having a cold/cough so others are not affected. In fact if masks are worn improperly and your hands touch the mask it can be harnful, Cleaning/ disinfecting a used mask is another problem. Be wary when buying a mask as they may be discarded ones being sold after cleaning. Safer to wear a cloth mask if you must when going out or one made from toilet paper/tissues that can be discarded after use. Black marketing in sales of sanitizers and masks are reportedly rampant.