That's definitely fungus, and it's not going to go away. The first question to ask is it affecting your image quality. If it is not then control the problem, always keeping the lens in a dry environment.
You could get it professionally cleaned, but honestly for that lens you could buy a replacement for a lot cheaper. You may also want to read about some ideas for reducing effectabout some ideas for reducing effect of fungus on the lens if you don't want to have it professionally cleaned.