<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
How do I bruise someone?
<|assistant|>
Bruising is caused by injury to the underlying tissue, often caused by the bleeding of capillaries. It can result from direct trauma, over stretching of muscles and soft tissues, or compression from external pressure. Common causes of bruising include hitting, falling, blows to the skin, and sharp objects like needles that pierce the skin. The extent and severity of the bruising will depend on the severity of the trauma.