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I'm not sure, it's hard to tell, but it does look like mold. The lighting might just be making the mycelium look a little grey. The texture doesn't look like cobweb to me, but it could be another type of mold. Can you see any cobweb-like threads running across the surface of the casing? Sometimes you need a flashlight at an angle to see them. How quickly has this problem developed? If you choose to give a moderate peroxide treatment, don't oversoak it, as that can make things worse. Several light treatments are better than one heavy one. If it is truly a mold, it looks like a bit too much to hope for a cure at this point.