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see this Walter Reeves answer for a close up of lichens and compare it to what you have on your Holly
It does look like though you may be sustaining some injury from mowing or weed eating too close by the look of how close the grass is to the trunk
however, i would have pruned one of those large trunks a long time ago before it grew into the other - they rub against each other in windy weather, and could cause problems since it's like an open sore where they rub.