Following is true about bayard's spots:-
Tardieu's or Bayard's ecchymoses/spots: Round, dark-red, well-defined, pin-head sized spots, found in those pas where capillaries are least Suppoed, e.g. conjunctiva, face, epiglottis, subpleural urface of lungs, hea, meninges and thymus. They tend to be better made out in fair skinned persons, readily visible in fresh bodies. Disappear with putrefaction. They are not pathognomic of asphyxia, and their absence does not exclude asphyxia. It can be seen in other forms of death--electrocution, poisoning, coronary thrombosis, in persons on anticoagulants, with bleeding disorders such as scurvy, leukemia and thrombocytopenia, but distribution is more generalized.
Asphyxial deaths
Due to the rupture of aerioles
Pathognomic of asphyxia
Present in putrefaction
Well defined, dark red spots seen over conjunctiva, subpleural surface of lungs, hea etc.
Present in putrefaction