The 308th prohibition is that we are forbidden from cutting off the signs of tzora'as or burning them in order to change their appearance.1

The source of this prohibition is G‑d's statement,2 "Be careful regarding the signs of tzora'as."

The Sifri says, "The verse, 'Be careful regarding the signs of tzora'as' constitutes a Biblical prohibition." Similarly, the Mishneh says,3 "Anyone who pulls off signs of tumah or burns healthy skin [within a mark of tzora'as] transgresses a Biblical prohibition," and is punished by lashes, as explained elsewhere.