Can anyone tell me what this strange ring is?

Asked July 7, 2016, 9:23 PM EDT

It's almost got a fluffy salt feel on the outer edge but the center and rest of wall is perfectly fine. It's a wet interior wall so I feel like it has something to do with that

Middlesex County Massachusetts

1 Response

Hard to be sure, buy my guess is that it looks like that area might have been a patch spot using something that had a different moisture permeability than the rest of the wallboard, so the edges of the patch might take on more moisture, causing paint failure. Another thought is that salt-like "growths" from wet mortar-type materials could be efflorescence, which is a salt that crystallizes from excess moisture and improper mix of the mortar.
In your shoes, I'd be inclined to sand it down and find out what's under that circular area.