Screened in porch is growing something!
About 5 years ago we added a screened-in porch to our home. The posts holding up the roof (which was tied into the existing roof) were vinyl covered to be "maintenance free". Now every summer we are getting "growths" that are developing in the corners where the screens are connected to the posts. Some of them are round, disk shaped, beige and look mushroom-like and some are brown humps and look like a bug hive/nests, although no bugs are in it. I am suspecting these are wood/tree molds of some sort, but I don't know. What is it and how do I treat it? It is freaking out the grand kids!
Thanks in advance for any help!