Our expert says:
The most common cause of dark circles under the eyes is an allergy. Because the skin is so thin there, if you get congestion of the veins under the eyes due to a blocked nose, it may shine through as blue shadows. Losing weight can also cause sagging of the skin under the eyes. There are creams you can buy for lightening the dark circles (look at beauty counters at Edgars/Clicks) but let him also use an antihistamine if he is allergic or has hayfever.
Cold used teabags or cucumber slices on the eyes may also help
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