@ofbushido Either doctor should be able to make a good diagnosis. The ENT, since it’s their speciality area would certainly know if this looks normal or not. But I think a physical exam is in order.
When the ENT gave you the recommendation to use the saline gel, did they feel this was an infection or just a dry area? Was this after your GP gave you the antibiotics for what he thought was an infection?
You could reach out to the ENT clinic again and get in to see a doctor there. You may not need a referral since you’ve already been in contact with them.

A dermatologist would also be a good option as this is a lesion on the skin and that’s their purview. You could ask your doctor which is the best option for the situation. But then you make the decision and be direct if you feel you’re not being taken seriously. You are concerned and this needs to be addressed. It’s been going on long enough. 😊