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At its core, soil pH is a measure of how many hydrogen ions are present in your soil. In highly acidic soil (low pH), plant growth is difficult due to reduced microbial availability in the dirt.

In highly alkaline soil, plants may struggle to grow due to iron deficiencies. In either case, a lack of balance deprives grass or plants of some key nutrients they need to grow.

A pH reading of 6 to 7.5 is ideal for most plants. Slight acidity is, generally speaking, less of an issue than slight alkalinity. Many plants can still thrive in slightly acidic soil.

Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

Apply fertilizer in early spring and late summer to promote robust growth through the seasons.

Consider lawn size, chosen products, and contract duration. Professional services may provide value through expertise and thorough treatment programs.