Sorry about the very long delay in replying to your question. We had a technical problem which has taken a long time to correct. The most common cause of your son's chin suddenly having a purple colour is if he bruised his chin. Did he fall or injure his chin in any way so as to cause a bruise? Or did another child possibly hit him on his chin? If there is no history of trauma to his chin, then other possible causes need to be considered. Then you may possibly be correct. A purple or dark blue colour that you noticed in your son's chin could be due to a lack of oxygen in his blood. The usual cause of this is a possible heart defect. If the purple colour is still present and especially if his tongue has a blue colour, then he must be seen by a paediatrician so that a proper diagnosis can be made.
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