My 3 year old son has a rash around his mouth that is persistent, and he now says it hurts. raised red bumps that are not puss filled or blisters. ?

See his doc: This could be a reaction to recurrent lip licking,allergy to something that comes in contact with the area often or a condition called perioral dermatitis. To sort it out he would need to see his doc.Treatment of the issues is different based on findings.

Painful rash: I would suggest you get him examined as medication may help him