I've not seen anything exactly like that. I've had yellow spots surrounding a dark dot. Stopped it with rubbing alcohol swab and a dry environment. The yellow turned back to green but the dark dot is still there (scar).
__________________
Anon Y Mouse
"Never attribute to malice that which is adequately explained by stupidity." Hanlon’s Razor
I am not being argumentative. I am correcting you!
I was afraid of that; I would say that the leafspots are caused by Cercospora sp. It likes to start with older mature leafs and has a habit of starting on the underside of the leaf so by the time you see it on the top side if the leaf it is well established. I would proceed with a fungicide treatment of the plant.