You should take this up with your doctor, it can mean several things, getting to the point is important.
Call a person in the medical field.
12? I thought you said you were 13, last year?
Whatever, check this out with your doc. it may be a metabolic problem, circulation, reaction to some sort of allergen, illegal drugs, toxins in your environment,high nitrogen levels in you drinking water or something else, pesticides,fertilizers,etc.
Get to a doctor ASAP.
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