that is nowhere near needing or wanting to frag it, nor should you blindly dip it.
that confusa wouldnt even flinch at an unecessary dip like some, but just the same its pointless unecessary stress
from what I can see I wouldnt do anything with it at this point but maybe take a toothbrush and clean out the dead spot real quick and lightly
if the dead spot continues to grow a at all i would prolly cover it up with a thin layer of superglue or epoxy. It will grow right back over epoxy much faster than glue