A blue blob is a type of stellar system found in intergalactic space.
Blue blobs usually consist of several clusters and star-forming regions within a few kpc, with no sign of an older stellar population.
There is nothing in the vicinity of these blue blobs, as they are surrounded by intergalactic space, sometimes for hundreds of kiloparsecs.
Blue blobs are also sometimes known as Ram Pressure Dwarfs, due to their formation likely being due to ram-pressure stripping of gas from nearby galaxies, which drifted through intergalactic space and then went through starburst, producing these blue blobs.
[1] The observed blue blobs have extremely high metallicities for their small mass.