More than ‘types’ PsA can be part of a wider group of conditions https://www.arthritis.org/about-arthritis/types/spondyloarthritis/. Thankfully, I am clear of one of these. Anything that involves inflammation can be linked. From personal experience, also uveitis, costochronitis and maybe autoimmune pancreatitis.
You don’t have to fit into just one box!
The really positive note for me was realising that there is one common cause for quite a few things. Also that they weren’t in my imagination!
Find the right drug for you (DMARD, or similar), and it can treat multiple things in one go.
Use the gel where the inflammation is close to the skin. Chest is good for me. Also good on my fingers, but careful what you are doing with this all over your hands! Pointless putting it on my knees, as the inflammation is deep in the joints.