Hi! One suggestion for you: if you have skin issues, go to a dermatologist. If you have skin issues and joint pain, try a rheumatologist.

I had to have multiple biopsies in order to get a correct diagnosis

The hard part of this is it is not directly diagnosable, it is a process of elimination of other inflammatory diseases and some family history. Also some blood tests like C reactive protein and ESR can indicate but direct observation of skin lesions or pain in joints with skin lesions is typically the way it is done. I had a great Dermatologist who diagnosed me with Psoriasis and treated me and ALWAYS asked me about my joints. When I started having those then she sent me to the rheumatologist and they worked together to arrive at a treatment plan. The deem said that the joint was more important to treat as damage is not reversible and that the skin should be cleared by whatever treatments worked for PSA. I feel so lucky to have had such great care and early diagnosis. So important to have a great team of Drs who care and listen! I wish that for everyone here.