Blue Nevus Developing at a Combined Tetanus, Diphtheria, and Pertussis (Tdap) Vaccination Site: Case Report and Summary of Vaccine-Associated Cutaneous Lesions.

Skin reaction may develop at the site of vaccine administration. A 54-year-old woman who developed a cellular blue nevus at the site of the combined tetanus, diphtheria, and acellular pertussis (Tdap) vaccine injection four years prior to presentation is described. In addition to blue nevus, other reactions at combined tetanus, diphtheria, and pertussis vaccine injection sites include abscess, deep reactive nodular infiltrates of mixed inflammation, and necrotizing granuloma. In conclusion, blue nevus can be added to the list of cutaneous events that can occur at Tdap vaccination sites.