I've been asked by a well meaning person who missed the signs in someone in their life years earlier, and ever since had been on the lookout.
Acting withdrawn (or shy) is one of the symptoms, as is fear of being touched. To someone looking in from outside, resistance to hugging or a dislike of hugging, could easily appear to have a fear or pain element, even though in your case it's more of a sensory thing.
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Only people who should be asking me this are therapists and doctors or psychiatrists, anyone who is qualified to ask.
I disagree. It causes no harm to ask and be wrong, especially if you do it sensitively and with and explanation. If you don't ask, it leaves the victim subject to great harm. It's better to ask and be wrong, just as it's better to question the adult trying to leave the store or school with the child screaming "you're not my father!" or "you're not my mother!"