Ruddiness can tell you about the blood circulation, whether it's poor or good.
From the courier-journal.com
A good mix almost has its own melanin, the darker the better, an almost Irish-cheeked ruddiness.
From the sacbee.com
Whereas he was of a fair colour, as they say, and his fairness passed into ruddiness on his breast particularly, and in his face.
From the en.wikipedia.org
But the reason for youthful blushing-which, like the ruddiness of old age, is due to the presence of anthocyanin pigments-need not be the same.
From the economist.com
Both Aveda and Sephora artists taught us that, though we have blue eyes and a pink-toned complexion, we can use brown eye products and slightly yellow-toned base to offset winter ruddiness.
From the online.wsj.com
More examples
A healthy reddish complexion
Ruddy (also called florid) is a reddish or rosy crimson colour.