During the shedding process, the first thing they do is try to split the skin on the head. Have you watched the shedding process? It's all about pushing off and onto things.
It looks like while he was shedding, he pushed against something that could have given him that gash.
Your vet, for a few dollars more than a tube of unmedicated poly or neosporin, will sell you an excellent antibiotic called silver sulfadiazine.
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