Shaving your head will allow you to attack the dandruff problem if it is a skin condition. Yes, your scalp will be much lighter in color than the rest of your skin since it's been hidden under a mop of hair. It will also be more sensitive to the touch and the air temperature at first. If you are shaving only to treat the dandruff, don't worry about how long it will take for the skin color to match. If, however, you decide that being bald is better than having hair, then the time for the skin tones to match depends on how easily you tan. I don't tan easily or quickly, so it took several month for the difference to fade.
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