AÂ plaqueÂ is a raised patch that’s more than 0.5 cm wide.
Leukoplakia of the tongue.
AÂ papuleÂ 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 noduleÂ is a raised bump more than 5 mm wide.
A bulla is a fluid filled nodule.
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