What is the likely cause of this facial lesion and resulting scar? (photo)

I've had mixed opinions from doctors from bacterial infection to shingles, to shingles with secondary bacterial infection. Began as severe itch and developed rash within the day. It progressed for a week then formed the scab and eventually left the scar. Was accompanied with gland swelling and swelling of face and mild fever. What are the probable causes and is there anything I can do to prevent recurrence? I am 32 yr old healthy (to my knowledge) male. Thank you for your time

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