Hello,
I have a lemon balm plant I grew from seed in my garden. It's growing up and out nicely, but a majority of its leaves have weird spots. Odd shapes/color..circle, oblong...beige-y in the center with a lighter ring around it.

I noticed a few of my mugwort's leaves now have the same spots. A google search shows similar spots on other herbs, but I'm a newcomer to the herbal world and don't want to misdiagnose the problem. I'm hoping someone with more knowledge can offer insight. Any help is appreciated! Thank you,
Jean