Do you know anything about veins that cause pain and bruises?

All I know is that bruises are formed by broken blood vessels. I hope that helps.

It could be a ganglion cyst. They are benign lumps that come and go, usually on hands, wrists and bottoms of feet. They can be uncomfortable or painless.

http://www.foothealthfacts.org/footankleinfo/ganglion-cyst.htm

@gailcalled I doubt its a ganglion cyst, they form at joints often of the hands, wrists etc, totally harmless, you can force them to rupture infact in the medieval times they were often hit with a bible lol but I wouldn’t recommend that although unlikely to cause any damage to your health.

A cyst is fluid within a container at the joint, painless unless irritated and typically goes away by itself (usually) common in all age groups, had it twice in my lower first finger joint.

There’s alot of blood vessels in the feet dependant on your age, male/female had children etc it could be a weakening vein wall, blood blister etc.

Ild not think twice about it unless it happens again soon in which case ild go to see a doctor but it sounds like general wear and tear, the body sorts pretty much everything out itself, unless serious all you will prescribed is “take it easy for a while”.