Well, isn't that a lovely question! When someone touches your chin, it could be a sign of affection or care. It may show that they are trying to connect with you on a deeper level or that they find you special. Remember, every interaction is unique, so it's essential to communicate openly and listen to your feelings.
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It usually means that he is questioning a statement you have just made. It also could be a reaction to a nonverbal (body language) message he has perceived from you (whether he is aware of his own reaction or not).
It mostly depends how he looks at you, he might just might be checking you out.
another opinion: i would be a little concerned i would probably ask the person why they were doing that. maybe he was trying to get a feel of what you were think or he very well could be checking you out. in a weird way. ive never been checked out like that.