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Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Median nodule of the upper lip as a "rare disease". More information about Median nodule of the upper lip is available from Orphanet
The term 'prevalence' of Median nodule of the upper lip usually refers to the estimated population
of people who are managing Median nodule of the upper lip at any given time.
The term 'incidence' of Median nodule of the upper lip refers to the annual diagnosis rate,
or the number of new cases of Median nodule of the upper lip diagnosed each year.
Hence, these two statistics types can differ:
a short-lived disease like flu can have high annual incidence but low prevalence,
but a life-long disease like diabetes has a low annual incidence but high prevalence.
For more information see about prevalence and incidence statistics.
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