Can you utilize a developer tool (firebug) to inspect the element and see if there is css applied to the image as a border?
Chrome has this built in natively, firefox you'll need to install the dev tool firebug.
Are you talking about the error box macro? https://confluence.atlassian.com/display/DOC/Error+Box+Macro+-+Example+of+a+User+Macro
If this is the case, you can simply delete the macro and the box will disappear.
I hope this helps. :)
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