howdy lonnielmb, What are the growing conditions (media, nutrients, pH, etc.) for the plant. I see some lighter yellowish areas in between the veins in the leaf, it could be a mineral deficiency, or some small critter. Have You looked on the underside of the leaf to see if there are any bugs? If I had to guess, I would say the it is the result of a deficiency (calcium or magnesium) possibly due to feeding or a pH imbalance.