Tampering with Signs of Tzaraat
"Take heed in the plague of tzaraat"—Deuteronomy 24:8.
It is forbidden to cut or burn off signs of tzaraat [e.g., white hairs] in order to change their appearance [so that the person does not appear impure].
Shaving Hair-Area Tzaraat
"But the patch shall not be shaved"—Leviticus 13:33.
It is forbidden to shave the hair [in the area immediately surrounding] a hair-area tzaraat affliction.