Q.What Kind Of Bug And How Do You Get Rid Of Them?
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Certified GKH Gardening Expert
Looks like aphid moltings. This article will help:
https://www.gardeningknowhow.com/plant-problems/pests/insects/homemade-aphid-control.htm
Here is an article that will help you to grow tomatoes to their potential:
https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-tomatoes-guide.htm
For a free, comprehensive ebook on the subject, follow this link:
https://blog.gardeningknowhow.com/ebooks/essential-guide-to-growing-tomatoes/