We are trying to figure out what is wrong with our citrus leaves. There are spots on the bottom of the leaves on our lime tree. They can be scraped off, small, circular, and are slightly raised. Some are white and some are brown, but it seems that they eventually fall off and leave a black spot. So, the newest spots are brown and they gradually get darker. The top of the leaf looks splotchy, opposed to being solid dark green.
The other citrus tree is begging to get them as well.
They do not seem to be insects when using a magnifying glass.