Zheng Ren had been observing the old man's behavior. His expression was a little indifferent, and his hearing had deteriorated. However, seeing how Su Yun raised her voice when she spoke, he guessed that she had suffered from the problem of having a hard of hearing during her lung cancer surgery.
In the few minutes that they had met, the old man had been subconsciously scratching his body with his hands. He was using a lot of strength, and Zheng Ren could even see the blood on his nails.
Parasite delusions was a rare mental illness where patients stubbornly believed that they had been infected with parasites. It was a mental illness, and patients often went to the dermatology department for treatment.
This time, it just so happened that the patient was Su Yun's old patient, so he came directly to the door.
