How often should I shower three weeks after a breast reduction and what precautions should I take?

Thanks for your question!  Even with a small superficial wound opening, you are fine to be showering normally at this point.  I ask that my patients not submerge themselves in water (bathtub, swimming pool) for at least 4 weeks or until all wounds are healed, so that would be my only restriction.  However, your plastic surgeon may have his/her own recommendations so I would advise you to ask your doctor's office what they would prefer you do.  Good luck!

I would ask your PS and follow his/her advice. I would shower as you normally do although for the wound you will need advice as to how to dress this. 

Thank you for your question. 
Congratulations of having undergone surgery. I hope you are pleased with the outcome and doing well. 
Three weeks out from surgery I would tell my patients that it is ok to shower on a daily basis, but to avoid sitting in standing water (bath, swimming pool,..) until all areas are healed and I clear the patient to do so. 
Having said that, every surgeon has a slightly different postoperative protocol. It is based on his or her experience and available literature. I would advise that you contact your surgeon and speak to him or her and ask what his or her recommendations are. 
Best wishes for your remaining recovery. 
Franziska Huettner