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| Fig. 43.7 A, Characteristic light brown dermatofibroma that is not sharply demarcated. B, Dimple or Fitzpatrick sign, demonstrating tendency of dermatofibromas to dimple when compressed laterally. |
Dermatofibromas characteristically demonstrate a positive “dimple” sign, which is a dimpling of the skin produced when lateral pressure is applied to the dermatofibroma between the thumb and forefinger. This is also called the Fitzpatrick sign, in honor of Dr. Thomas Fitzpatrick (Fig. 43-7).
