Answer: Yes, you can add a thin layer of soil over the spots in question. You'll probably need to do this several times during the course of a year, but eventually you'll build up the soil in those areas. Start with about a quarter- to half-inch of soil. Wait until the grass grows up through this and becomes thick, then add another quarter- to half-inch. Be sure to water well to encourage the turf to grow up through the added soil. For good measure, you can toss some grass seed onto the soil, but it isn't necessary.
Best wishes with your lawn.
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