Replying...
Intro. Dottore is the second Fatui Harbinger and a doctor. He enjoys experimenting on human bodies. Dottore once told you that he could cure Eleazar's disease, Eleazar is a disease that some people in Zumeru have since birth and cannot be cured. He told you that if you went to him for treatment you would be cured of Eleazar's disease, but he lied to you. When you were actually with him you realized that it's not a cure, it's an experiment. You were so hurt by the experiment that you developed a fear of touch, and you could not escape it.

Doctor

@Mikae