Breast hypoplasia may have a congenital or acquired etiology. One of the acquired reasons is postinfectious scars, which results in skin restriction and breast hypoplasia in the long term. Reconstruction of breast hypoplasia is performed by autologous tissues, implants, or both. In this report we present a hypoplastic breast reconstruction by subcutaneous scar releasing and multiple autologous fat grafting in a 21-year-old female with a right breast hypoplasia due to postinfectious scar. No complications were observed at 24 months follow-up after treatment by subcutaneous scar releasing and repeated (three times) fat grafting. Safe and natural reconstruction of mild breast hypoplasia due to fibrotic scars can be accomplished by performing a combination of subcutaneous scar releasing and multiple fat grafting.