Image Challenge

Here is your challenge for today.  This tender, crusting lesion appeared on this 69 year old man 10 days ago.  It did not respond to antibiotic treatment.  He had no trauma and is healthy. What is the diagnosis?
1.  Actinic Keratosis2.  Impetigo3.  Squamous Cell Carcinoma4. Candida infection5. Inflamed Seborrheic Keratosis
Make your best choice and the answer will be posted tomorrow.
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