Are you referring to the white specks, or the rainbow?
Did this discussion not answer your question?: https://www.photrio.com/forum/thread...readed.182420/
Or that small semi-circle next to the edge around 6 O'clock?
Those 3 dots are nothing to be worried about. Even if it is schneideritis, it's going to take years or decades to advance, if it does at all.
Will have zero effect on your images, even if they were in the center of the lens. Every used lens has some sort of flaws, of which most will not be visible in your photos.
It's more critical that the lens coating is in good condition, which your appears to be.
The only way to guarantee a pristine lens is to buy one new with a satisfaction guarantee, and keep returning lenses until you find a perfect one.
Flickr: https://www.flickr.com/photos/photo_jim/
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Not schneideritis...
The spot about 6 O'clock appears to be de-cementing or separation of the lens elements.
The greenish-purple reflection about 10 to 2 O'clock is from the multicoating, normal. If there is separation or de-cementing behind that reflection it cannot be visible due to that reflection.
Better images will help sort this out.
Bernice
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