this isn't HITH. in HITH the flesh literally drops off in chunks.
looks like an infection of the fish 'sinuses' with some fungus thats resistant to MB.
best thing you can do is to do a 70% wc and do a 1 ppt[100g 100l] salt treatment first to see how it goes. in mean time, you can try a 3ppt salt dip for the fish. 5 to 30 minutes. remove fish as soon as you see it tilt.
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