Which preposition to use with callosity

above Occurrences 1%

The animal used to bite at his coronets and also the callosities above the knees and hocks until they bled, which they did quite easily.

for Occurrences 1%

Suddenly, close by the massive post which marks the centre of every Hindoo tank, a huge scaly snout slowly and almost imperceptibly rose to the surface, then a broad, flat, forbidding forehead, topped by two grey fishy eyes with warty-looking callosities for eyebrows.

on Occurrences 1%

Owing to emaciation and disuse of the bow, the callosities on the forearm, usually caused by the bow-string, were not sufficiently prominent to prevent the bracelet from slipping down from the wrist to the elbow, when the arm was raised to support the head.

Which preposition to use with  callosity