Are Bald Spots in My Beard Related to Minoxidil Use on My Scalp?

I used to be able to grow a full beard. Now there are patches over my face where absoultely no hair grows. Is this related to monoxidil use on my head? Or could this be from something
else?

No, it is likely from something unrelated. Minoxidil on the scalp does not cause you to lose hair elsewhere on your body.