Former Psychologists And Smaller Nega's

What is the din if a נגע צרעת was the size of two גריסים, the person was confined-quarantined [מוסגר] and then the Kohen checked him and the נגע SHRUNK [which is also a person who USED to be a psychologist] to one גריס [usually the minimum shiur נגע]. Do we quarantine him for another week or set him free??