The development of giant lipoma on the BCG vaccine caused scar

Lipoma is the most common mesenchymal tumors that accounts for about 6% of all soft-tissue tumors in children. The lesion size is usually around 1-2 cm that rarely reaches the bigger diameter. A 14-month-old baby girl was brought to our clinic for a progressively growing lesion on the left shoulder. The lesion started 4 months ago, and then was rapidly growing that caused pain and movement restriction. On the same site, there was a scar of BCG vaccination. The clinical and histopathological findings of the lesion were consistent with lipoma. The lesion was totally resected with no recurrence within 12 months. There are several complications related to BCG vaccination. However, the occurrence of lipoma on BCG vaccine caused scar has not been reported in literature. We reported this case because of its rarity and to emphasize that lipoma can present as a giant lesion in child.