I don’t think Messmer visits the jar clinic in his Keep often… they remind him too much of his Mother.
Btw, he wears a golden ring on the middle finger of his left hand…
in Palmistry, that indicates responsibility, balance, justice. usually it’s sth the head of the family wear, but no other characters wear sth like that. he’s truly the sole heir to all of Marika’s happiness & all of her pain.