Ayakashi Kaii Dokoro

Please take note.
The illnesses of patients who visit this shady doctor are...

There is apparently a doctor in a certain town who will treat any illness.
However, he is known as a "quack doctor" because he will treat both humans and spirits for money.
Humans and spirits suffering from strange illnesses visit this shady doctor...
Those with secrets, those with evil desires, and those crushed by regret --
Today, patients visit the highly suspicious doctor.

https://comic-porta.com/series/2901/