Inferior labial veins
Venae labiales inferiores · Dolní retní žíly
Veins
Looks like
Small veins inside the lower lip, running along it near the inner lining.
What it does
Drain the lower lip into the facial vein.
Keeping it well
Small blue swellings of the lip (venous lakes) are harmless. A lip sore that does not heal in three weeks should be checked.