Diagram of reptilia, pisces, mammalia
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thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.