Sunspots can last from days to months, so for it to have returned is not an unusual event.
The large sunspot (called AR2665) that rotated out of view returned (Aug. 1-2, 2017). Though much reduced in size, it did blast a good-sized coronal mass ejection a week before on the far side of the sun (see the previous video PIA21866). It was showing off numerous magnetic loops and arches above it as it came into view. Sunspots can last from days to months, so for it to return again is not an unusual event.

Image © NASA/GSFC/Solar Dynamics Observatory.

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