I am sorry about your diagnosis but at least you are the road to treatment that will bring great improvement in your health.
Tumid lupus refers to the particular sort of skin lesions that appear different from discoid or sub acute lesions.
Like any sort of lupus skin it may have a greater or lesser number of other symptoms but this sort is more likely to have systemic symptoms.
There may or may not be any confirming blood work.
It is especially photosensitive so take the utmost care to protect yourself/avoid the sun.
If Plaquenil doesn't help enough then add Quinacrine to it ~ this can make a dramatic difference.
Do search the term for full information.
Best of luck