Systemic Lupus Erythematosus Why Is The Butterfly Rash In Systemic Lupus Erythematosus Was Called Such?

Why is the butterfly rash in systemic lupus erythematosus was called such? - systemic lupus erythematosus

In addition to the shape of a butterfly, there are other mechanisms by which the appearance of butterflies and eruption are visible in the affected patients? I hope you can help me. Thank you!