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Do you notice any swelling around the scab?
Is it very painful?
Infection is one possibility. Best wishes,It was my pleasure to help you today.If I have answered all your questions, Please rate my response Excellent (click on the 5th star on top).Please bookmark my profile for fast, reliable authentic answers!This is the link to my profile:http://www.justanswer.com/medical/expert-mysticdoc/
Ok in that case, there is likely bacterial infection --comes from the skin.
Sometimes can cause infection like staph or strep.
In that case antibiotic will be required.
Better to check in urgent care.