plaque is a raised patch that’s more than 0.5 cm wide.

leukoplakia

Leukoplakia of the tongue.


papule is a raised bump that’s less than 0.5 cm wide.

A vesicle is a blister (fluid filled lesion) less than 5 mm wide.

A nodule  is a raised bump more than 5 mm wide.

A bulla is a fluid filled nodule.

OLYMPUS DIGITAL CAMERA

OLYMPUS DIGITAL CAMERA

Fibroma (presenting as a nodule) By Klaus D. Peter, Gummersbach, Germany (Own work (own photograph)) [CC-BY-3.0-de (http://creativecommons.org/licenses/by/3.0/de/deed.en)], via Wikimedia Commons