Answer: Some Japanese maple varieties have bark that, with time and age, develops white striations or streaks, some have a corky texture, some are described as warty, and so on. This is part of the ornamental charm of the tree and helps add four season interest. I suspect what you are seeing is probably normal, however for reassurance I would suggest you compare it with similar trees at the nursery or possibly take a photo or sample to either your county extension or a professionally trained nurseryman for consultation. Good luck with your maple!
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