because i'm a relatively new grower who hasn't dealt with pests/diseases very much, i can't say whether it's caused by a pathogen. BUT i can tell you that several of my phals (which like low light) have developed that strange pitting/scarring due to being exposed to direct light for much too long, so it may be a lighting issue. the leaves on your paph look like a pale green, almost a bit yellow, which is a symptom of overexposure to light. i searched up paph venustum and it seems that the species is more shade-loving.
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