1. A fracture from injury which rehealed
2. A hole in the skull from an invasive injury
3. A mark left by a blister or growth on the skin
4. Caused after death by bugs or insects
Against: I have never seen this before, and why would the insect or bug eat in a circle ?
5. It was from an ear muscle.The groove was at the base of the outer ear (the skin bit), like on this roe buck here:
There are three muscles which are used to turn the outer ear, and I think these are attached to the skull. What if one of the muscles was pulled hard after death ? Could this have damaged the skull ?
Here is a dead roe buck where a fox or other animal has eaten the outer ear off:
For: It is sort of in the right place.
Against: I think it is unlikely to damage the skull in this way, and I have never seen this injury before. Do muscles attach in a ring ? I think they attach in one spot.
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