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Hi and thanks for the query.
Dark circles and prominent veins under the or around the eyes occurs when the skin around the eyes starts to thin. This is genetic in some individuals and they have very thin skin genetically. Some issues however, need to be ruled out if this is a recent occurrence. Anemia is the first thing that come to mind. Irritability, pale skin, lethargy and lack of energy are some signs and the most notable cause is parasitic infestation of the alimentary tract, in children.
Eczema, congestion, sun exposure, skin infections are other causes.
I suggest that you take him to his pediatrician soon for a detailed evaluation and a pertinent diagnosis.
Hope this helps.
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