I cant see very well, but what I can see isnt HITH.
It looks like it to me. Looking at the third picture you can see that the lateral line is starting to "pit" as well.
Are you running carbon in your filters?
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Only place I have ever seen HITH is on the area between the eys, down to the nostrils. Never under the eye like that. It is usually white, as well. I don't see any white.