Friction burn on the skin indicates that

Friction burn: Extensive, superficial, reddened excoriated area minimal or no linear mark Occurs when the skin is covered by clothing or the person is dragged on smooth surface (eg. on a marble floor) Brush burn: Graze abrasion involving wider area such as the back, caused by violent rubbing against a surface, as in dragging along over the ground. In an abrasion caused by a tangential force, the direction of the force can be determined by epidermal tags.