Here is a close up of what it looks like.

That looks like Fescue or Annual Ryegrass (purple base) Where are you located?

Located in Cape Cod MA.

Thanks for the feedback. Should I be concerned/try to get rid of it?

I think you are showing the wrong grass in the second picture. The light green stuff looks like it is growing faster than the rest of the lawn, and it looks much lighter than the stuff in your hand. It could be any one of a handful of grassy weeds such as poa trivialis, orchard grass, barnyard grass, etc. Unfortunately grassy weeds are some of the toughest to control, and if it is poa trivialis, it's damn near impossible.

A change in color of a particular area might be due to a number of reasons. Since most grass seeds are a combo of more than one type, it is often that a seeding job might contain more one type than the other....and produce a grass type that is different in color.
Over time, the nature of the soil's make-up, will decide on how the color of the lawn will proceed. Given time, the lawn will use the soil's balance/imbalance to decide on the color.
In other words.....you can wait it out.

You might fertilize the area more to affect its look. A high nitrogen type will usually encourage its growth to merge with other grasses.
Overseed. Spread a type that will influence it...and its neighboring type. Generally, northern lawns are given a combination of Kentucky Bluegrass, Perennial Ryegrass and Fescue. Each type then gives its best when circumstances make it difficult for one or more of them.

That second picture is 100% pulled from the bright green portion of the lawn.

I think auteck called it. I can't see the auricle, but the vernation looks rolled, which rules out bluegrass, most fescues and perennial rye, so that narrows it down to Tall Fescue or Annual Rye. The rapid growth indicates an Annual Rye, but to really be able to tell you would look for a claw-like auricle, which I can't see at the angle in the picture. I included a link to help distinguish the auricle if you want to do a little self diagnosis.

If it is the annual rye, it will die off in the heat.

Here is a link that might be useful: grass parts

OK thanks! I will take a closer picture once it stops raining here.

If it does help, a couple of the pieces of grass have developed seed heads out of the stalk of the grass.

Thanks again

So my lawn tech was over on saturday and walked around the property with me. The conclusion that it was contaminated grass seed that they put down when they overseeded in the fall. It is definitely annual rye grass. There is obviously not much they can do now but promised to take care of it in the fall.

My question is whether or not there is anything I can do to get the color to stand out less? Will a higher nitrogen content cause the rye grass to become a darker green?

Thanks for everyone's help.