Feature which differentiates true from aificial bruise is -
The synopsis of forensic medicine & toxicology ; Dr k.s.narayan ; 28 th edition Pg .no. 110 Table 8-3 Shape of true bruise is usually round while that of aificial bruise is irregular .Erythema & swelling seen in the surrounding area in case of aificial bruise not in true bruise .In true bruise erythema and swelling is seen in the site .
Round shape with irregular margins
Irregular shape with regular margins
Swelling of surrounding area
Erythema of surrounding area
Mechanical injuries