Out Of Love

When a person gets צרעת he is halachically not considered impure until the Kohen pronounces him so. Why is that?

A Kohen is commanded to bless the Jews באהבה. The Kohen embodies love for fellow Jews. Only such a person can call another person "tamei". Before you criticize - ask yourself if you are saying it out of love.

Then - don't say anything. Don't worry about it, in all likelihood this person is being criticized enough. Once you have mastered not criticizing - then you can start criticizing on rare occasions out of total love.

[Based in part on the Lubavitcher Rebbe]