Can you help me understand how to tell the difference between psoriasis vs. a lupus related rash?

I used to have it on my scalp. Used to have it on my wrists. For a while now I've had it in my ear canals. This week I have it starting where my ear lobes connect to my jawline. Basically, its red, then scaly, a little "wet."

The other thing I have going on is small red pimples that crust and shed near my mouth and chin. I went to the doctor for it one time (before suspecting lupus) and she told me it was not acne. She thought it was some rash I'd never heard of but now I forget what...she seemed perplexed by it.

Ugh, it all sounds so gross to type it out!!!! These things come and go though I usually have some somewhere. But this week my joints have been more achey and the rashes have increased.