Scientist skins a man alive at the end of the movie

I don’t know if Boris Karloff was in this movie or Bela Lugosi but it was right around that era. It was a black and white movie about a man who has another man captive tied in chains. The only scene I remember was that the scientist was in the basement where he kept the man captive and all you saw were there shadows against the wall. If I remember correctly, the shadow of the man that was held captive was laying down on a table in an upright position.  And then the scientist said something along the lines,  “Remember when I told you I was going to skin you alive?” You see the shadow of the doctor reaching for a scalpel or knife, and he proceeds to skin the captive man’s neck. And that’s how the movie ended.  Anyone know the title of this movie? Thanks in advance!

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