In some cases, light therapy or laser treatment might be used to target discolored areas of skin. This can be especially helpful for lightening sun spots.
I don't think it matters whether you fight Bowser before getting all the stars or not. As long as you have 120 stars when you defeat him, you'll get Luigi.
Remove them with a pumice stone. Apply gentle pressure with your stone, only removing layers of dead skin and not healthy tissue. Feel the affected area every few strokes to...