Hello and welcome to the forum. We're glad you found us! Sorry for a delay in answering your question though. Have you seen your dermatologist at this point to give you feedback on your report. We'd love to know what the turn out was from your doctor and the explanation that they gave you. It would be really helpful for others. Medical reports could be so much easier to read with a word key, wouldn't they? You do have a good grasp on this for as you've dealt with it for so long.
Some people have more than one thing going on as well. For the spots on your head, trying the two types of shampoos could be beneficial. Nizoral helps control things as it has ketoconaozole. Bumps on scalp caused by these things can diminish with this shampoo. T Gel can work for psoriasis. Both easy to try. Perhaps you have.
It's actually my understanding that moderate to severe psoriasis can result in spongiosis. If you haven't read it, this article is helpful. You can copy and paste it into your browser. https://www.sciencedirect.com/topics/medicine-and-dentistry/spongiosis
Any update of your situation would be much appreciated!