Meanings of hard nodule in English

He savored her familiar taste, licked slowly, and then found her small, hard nodule.

He reached his tongue forward and found her hard nodule buried deep in her folds.

Only after ten to fourteen days a hard nodule presents itself, which, soon breaking, forms an ulcerating sore, which continues until the animal dies.

Background: Keloids are hard nodules or plaques formed by excessive proliferation of connective tissue.

"There... feel that?" He let me touch the bottom part of the tube, where a small, hard nodule appeared to have lodged itself.