Any mold on it? If so, I'd definitely tear it out, if not, I wouldn't worry about it. Although if it's a textured ceiling it may fall apart the next time you (or whoever) paints it, the water can cause the textured coating to come loose from the drywall.
Edit: I read it as 6" x 6" the first time, I would be far more concerned over that large of an area. There's no way to dry out the water that seeped in between the framing and drywall and mold WILL grow in that area.
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