Tara in Sacramento

I have a generic memory foam mattress. Prior to my ever setting foot on it or touching it I put on two different mattress covers when I was taking the mattress covers off today so that I could wash them I found on my mattress underneath the cover that it comes with, there were these bluish greenish spots so I cut little holes to find out what it was and it was some type of lose growth but it didn’t look like mold. I usually spray my bed with enzyme spray and then let it dry but I am very perplexed as to what this is I will attach a picture if I can can somebody please help me and tell me what this is

Questions:

Please help me identify what this growth is or should I say growths on the underside of my mattress.