In this case, there is a mystery condition that includes skin rashes, and the doctor is the quack who decided it is wifi. The symptoms are probably not psychosomatic at all, and are unlikely to go away in the short term. The goal is to come up with responses for the school that will accommodate real conditions and not spend too much money on fake conditions, without the school having to try to second-guess a student's doctor. So if their doctor says it is something that is a known psychosomatic condition, then the school should take reasonable steps to minimize triggering the student. The same way that if they have an agoraphobia diagnosis, which in the past was controversial, you can take reasoned steps to minimize the situations that would be most problematic, and adopt special considerations for the student to be excused if having an attack. And a student with severe allergies might require that all the teachers for their classes get special training from the school district in administering emergency medication. In this case, it is not a controversial condition, but a known and well-understood one: Quackdoctoritis.