According to my research on studies made by different medical professionals, It is said that Hematoma is generally defined as a collection of blood outside of blood vessels. There are different types of hematoma. The one described in the question fits the description of Chronic subdural hematoma. This is a type of hematoma that is located under the covering of the brain (dura) and it begins to form several days or weeks after receiving a head injury.
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Lightweight clothing because dark clothing will hold heat, waterproof clothing will stick to you and make you hot, and tight clothing will make you sweaty and hot
It is important tp evaluate the consequences of each option before making a decision because this will help you reach a decision that has the least negative consequences.