These seems to be miniute dots now. But if you want to check with deficiency symptoms, refer this https://ariesagro.com/tomato/ - As it helps you to understand the current stage of the deficieny in tomato plants. Fixing such deficiencies are really not hard these days, all you to have to do is need to analyze the type and its stage. Analyzing these factors helps you to choose the right agricultural product to boost your productivity and growth.