Since a few months i have a returning sore crack on right corner of my mouth. could it be herpes even though i never had any blisters? or what is it?

Possible.: It is possible that it is herpes, but it does not sound like it. there are vitamin deficiencies that can cause this. Thus make sure you are eating a well balanced food plan with many fruits and vegetables. Hydrate well. If things continue, you should get in for evaluation. Good luck.

Get checked: Without a proper exam of the rash it would be difficult to give the best answer. Consider sending us a picture. Testing may be necessary