Well that was certainly disappointing for you! I was really hoping, along with you, that the dermatologist would have some idea of what’s happening with the redness of your ears and the excessive sweating.

I’m just wondering if you’ve had any tests to see if you have an overactive thyroid (hyperthyroidism) or low blood sugar (hypoglycemia). Both conditions can cause excessive sweating called hyperhidrosis.
https://www.healthgrades.com/right-care/thyroid-disorders/hyperthyroidism-face
Don’t give up hope! I think the next step is checking back in with your primary care physician, letting them know that this is serious and you need help. They may need to play detective with you.

Another option to consider is a Functional Medical practitioner. Functional medicine doctors use specialized training and techniques to find the root causes of chronic illnesses. Here’s a link to find a provider in your area: https://www.ifm.org/find-a-practitioner/

Do you have any issues with your the cervical area of your neck? How about medications? Some of them can cause side effects such as sweating. Did your symptoms begin after any event, such as an illness, that you can recall?