Tomato plant with yellow and brown leaves
The spots on your tomato leaves resemble early blight lesions somewhat but we don't think they are early blight lesions. You can look at the early blight photos on our site and see what you think. Early blight is a very common fungal disease and it would be unusual not to see symptoms, especially on older, lower leaves. Removing infected lower leaf branches is recommended.
The non-distinct spots and discoloration in the photo may have been caused by environmental factors- e.g., leaf rubbing or leaf burn from hot object, liquid fertilizer, or wind.Let us know if symptoms worsen. jt