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The bags under your eyes might not be the result of an acute physical injury like a bruised shin, but they, too, are the result of vasodilation and swelling.

“The combination together . . . it’s like about 30 minutes plus of just vasodilation, a bear’s chasing you, you’re deer in headlights.”

But this group also provides important benefits in keeping your blood vessels healthy, by promoting something called "vasodilation."

Perhaps the vasodilation due to heat is beneficial over the long term, but I am not sure if there are any studies.

These details will be interesting to unpick, as the plot of this vasodilation whodunnit thickens.