B: Is the border ragged or irregular?
C: Is the color reminiscent of a contagious skin disease?
If you see anything suspicious, don't delay: photograph the offending specimen and submit it to a licensed professional* immediately.
*And by "licensed professional", I mean "the blogger who specializes in ridiculing ridiculous Wreckage". (Now say that three times fast...)
Eric P., thanks for this important reminder.
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