Hello and Welcome Deb;
Many of us can understand and empathize with what you are going through. I just don't understand dismissive rheumatologists..I really don't get that at all.
At any rate, if you are dealing with an auto-immune issue, and if that issue is Lupus, it is not uncommon for flare-ups to occur during pregnancy and especially after child birth. You skin manifestations do sound like Lupus Lesions as well as a form on Lupus Rash. Often, you will be prescribed Plaquenil to help alleviate the lesions and rashes. Plaquenil is a cumulative drug, so it takes weeks to months before noticeable improvement is seen. But once it does start working, the results are usually very good.
Hopefully, your biopsy will give some definite answers to what is causing your skin issues. If it is an auto-immune problem, perhaps you can talk to your doctor about starting Plaquenil in order to address those issues.
Whatever the case, we are all here to help you as much as we can and to give you information and answers. Welcome to our family, I am so glad that you are here.
Peace and Blessings
Look For The Good and Praise It!