I would lean on this being a fungus, but as I am no expert myself I would wait for someone else to also come to that conclusion. What I would recommend in the meantime is moving the affected fish to a quarantine tank, if possible, and following the salt treatment guideline provided by one of aquarium coops blog articles (https://www.aquariumcoop.com/blogs/aquarium/aquarium-salt-for-sick-fish). If that doesn't work and your current medications also appear to not do anything, I would suggest switching to medications with other types of active ingredients (so no maracyn, as that contains erythromycin, and avoid ich-x's active ingredient of malachite green). I hope others here may be able to better narrow down the disease for you and I hope your fish do better!