Welcome to our family. Even though you are not diagnosed, you are still very welcome here. If you believe that you may be suffering from Lupus (or from any of the 100+ auto-immune disorders), this is the place to be.
While your rash does sound like one of the Lupus rashes, without blood tests etc. , it is impossible for us to say if they are indeed Lupus rashes. I applaud you for the incentive of taking the test. I hope, however, that if it is Lupus and it reacts negatively to the sun exposure, that you do not suffer from any other symptoms worsening as a result. Unfortunately for us, sun exposure can cause flare-ups in more areas than just our skin. So do be careful, please!
We are here to help you as much as we can. Hopefully you will not have Lupus, but if you do, we will do all that we can to help you understand this disease, how it affects you, and to offer you advice and support.
Peace and Blessings
Look For The Good and Praise It!