Small injury causing big size bruise: (AIIMS May 2014)
a. If the tissues affected by a bruise are vascular and loose such as face, vulva, scrotum, then a slight degree of violence may cause a large bruise to appear.
b. On the contrary, if the tissues are strongly supported and contain firm fibrous tissues and covered by thick dermis such as abdomen, back, scalp, palms and soles, a blow of moderate violence may produce a comparatively small bruise.