Which disorder could develop in the human body when the immune system attacks a usually harmless enviromental susbstance

The answer is allergies because that's the only answer that results in environmental issues.

Calcinosis is the diagnostic term that means an abnormal buildup of calcium on the kneecap (patellar) surface. it is a term uses to describe a group of disorders in which calcium deposits form in the skin. it is also referred to the abnormal deposit of calcium phosphate.