I think the 'normal' spotting refers more to the sort of reddish 'freckles' that some get in high light situations. My purpurata has those spots and they do look exactly like freckles. What is shown in your photo looks more like fungus or sun/chemical burn. I have this occur occasionally...I just cut away the affected area and dust with sulphur. Usually, I spray with a mild fungicide just to be safe.
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