from an online source;
4. Fingertip/pad bruises
Where an assailant has forcefully gripped a person, for example around the neck (e.g. during attempted manual strangulation) or arms etc, one may see small discoid or ovoid bruises in a cluster. These may be discrete, but are often blurred or may 'merge' with one another, due to the dynamic nature of assaults and struggles with an assailant.