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nodule - (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment) mineralogy - the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them.
Nodules are a severe form of a common type of acne known as acne vulgaris. Although they are grouped together with whiteheads, blackheads, and pustules, that may feel like a stretch to those who suffer from them. Nodules are larger than the typical pimple bumps, and they look like raised ovals covered by skin.