White mini started having “rusty” tears

Hi schnauzer gang!

I have a 7yo male white mini schnauzer (I’m as well a first time dog owner) and for the last 6 months he started having those wet reddish eye boogers.

We once had an issue like that when he was 2 yo however that passed without special therapy. For the next 5 years no issues and now all of a sudden it started up again.

Did anyone have a similar experience? What causes this?

I used to think that dogs either have that problem or don’t.

Any advice?

Thanks in advance