ComplicationsBy Mayo Clinic staff
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In some cases, ringworm of the scalp causes kerion — a severe, painful inflammation of the scalp. Kerion appears as soft, raised swellings that drain pus and cause thick, yellow crusting on the scalp. Instead of breaking, the hair falls out or can be easily pulled out. Kerion may be caused by an overly vigorous reaction to the fungus and can lead to permanent scars and hair loss.
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