Which preposition to use with blobs

of Occurrences 9%

Also at the top fold of his ears he has rather a pronounced blob of flesh.

in Occurrences 3%

" At that Miss Hassiebrock's ears, with the large pearl blobs in them, tingled where they peeped out from the scallops of yellow hair, and she swallowed with a forward movement as if her throat had constricted.

on Occurrences 1%

But it is impossible to cook a fish before the fire without the skin of it rising in some place or other, and so there came a blob on the skin, and the cook put her finger on it to smooth it down, and then she put her finger into her mouth to cool it, and so she got a taste of the fish.

Which preposition to use with  blobs