So this fungus has recently exploded on my lawn. It's mid august and I don't know if I should be doing anything other than waiting for fall to aerate/overseed. The pics are what it looks like after a rain or in a wet morning. When its dry it just looks like little dead spots. I wonder if I should either buy a fungicide or have it professionally treated. Too late?

• It is a fescue lawn in lower delaware, zone 7b.
• Haven't had irrigation on in a few weeks but we have had a lot of rain with more to come
• Soil is poorly drained clay
• Have 3 trugreen treatments a year
• Cut to about 3.5" and use a mulching blade