He will look for it, and if he does not find it, he will fabricate it. An individual sees himself reflected in his friends' behavior. The Baal Shem Tov says that one who is inherently good perceives good wherever he goes. One who is flawed sees flaws in everyone. Moreover, whatever we see is essentially a message for us regarding our own behavior.
Nothing is coincidental.
Indeed, we should look for Hashem's message thoughout our every endeavor. As a result of metzora's lashon hora, people would end up quarelling. Since the metzora caused arguments within the community, he must now be left alone to reflect upon his sins. This shall be the law of the metzora. Nowhere do we find a sin such as lashon hora, in which the punitive efforts to cleanse the individual and bring him to teshuvah are visited upon him in a descending order.