We can actually deduce that the deformity of the old man that Hester knew is: One shoulder was higher than the other.
This question is related to "The Scarlet Letter".
<h3>What is "The Scarlet Letter"?</h3>
The Scarlet Letter is actually known to be historical fiction which was written by Nathaniel Hawthorne, an American author. It talks about how Hester was punished for her sin.
We see that the deformity of the old man that Hester knew is one shoulder was higher than the other.