Skin malignancies can originate in burn scars (Marjolin's ulcer). The most common is squamous cell carcinoma, usually appearing years after injury. Split-thickness skin graft donor sites as a source of malignant transformation are far less frequent and demonstrate a shorter interval between surgery and tumor onset. Keratoacanthomas have rarely been reported to arise in such scars. We describe the simultaneous occurrence of keratoacanthomas on a spontaneously healed second-degree burn on the flank and in the scar of a skin graft donor site on the thigh, 4 months after a 40% total body surface area burn.