Transfascial muscular hernia: an unusual cause for a "hide and seek" subcutaneous nodule.

Subcutaneous masses are usually difficult to diagnose for dermatologists using palpation. We report a case of a disappearing leg nodule that appeared with muscle compression. This is characteristic of a transfascial muscle hernia. Ultrasound is the key to identifying an area of fascial alteration. Treatment alternatives of this unusual condition are discussed.