'Manufactured' disease

Is fungal disease rampant in society? Apparently. How can we know this? Vast numbers of these antifungal drugs are manufactured and sold. Then prescribed by doctors. But is the disease 'manufactured'?

Create an alleged disease and then provide a pill to 'beat' it. It has to work as the circumstances in which it is 'needed' can be engineered.

But, maybe not.

Consider.