Smallpox vaccination site complications.

The typical resolution of the smallpox vaccination site is a smooth scar, a sequela that is discussed during prevaccination counseling. In addition, other types of lesion may develop at the scar site, including short- or long-term benign and malignant changes, as reviewed below. Although current recommendations do not discuss potential scar complications or scar surveillance, healthcare providers would benefit from an awareness of these potential complications, and should consider periodic scar surveillance as part of a general physical examination.