Tradition says that tzaraat (usually translated as leprosy) can be caused by lashon hara (evil speech), but #torah doesn't explicitly connect it to any particular sin or behavior. The tradition is based on implications and associations, such as Miriam turning completely white when she spoke against Moses, and the broken relationships caused by tzaraat.

It might not have been a biological disease at all. What we call "leprosy" today is Hansen's Disease and doesn't have the same symptoms. Tzaraat probably spans a range of pathologies and is both physical and spiritual. Lev 13-15

https://soilfromstone.blogspot.....com/2010/04/biblica