Introduction Most basal cell carcinomas (BCCs) can be diagnosed readily on the basis of a medical
history and clinical examination, particularly when various ‘red flags’ are taken into
account. The purpose of this article is to show two cases in which BCCs have apparently
remained unchanged for over 20 years, masking one of the major indicators of
malignancy: change. A general practitioner must maintain a high degree of vigilance so
as not to miss those BCCs that behave in an atypical manner.
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