Hi. It sounds like you're still in the process of figuring out a diagnosis, right? That can be frustrating, especially when you trust a doctor to help and come away empty.
This article gives some guidance about how to approach the process with your doctor and figure out if they have the skills and knowledge you need to move forward. I know you don't have a definitive answer right now, but you could suggest, "I really think I'm dealing with psoriasis here. What do you think about this? Can we try some things assuming it's psoriasis and see where we get?" In addition to a dermatologist, you might find you can get some answers with a good rheumatologist.
https://plaquepsoriasis.com/living/appointment-guide-newly-diagnosed
Don't be afraid to ask for a referral or second opinion if you're not getting anywhere. You deserve to have competent care.
Keep us posted, okay? -Melissa, team member