Question: Is butterfly rash a symptom of Systemic lupus erythematosus?

Context:
Diagnosing SLE can be challenging because of the myriad of clinical features and substantial variability between patients. Cutaneous involvement is present in about 60% of cases and typically manifests as a malar or butterfly rash.
The prevalence of systemic lupus erythematosus (SLE) is 28 per 100,000. 
We report a 12 years old female patient with an overlap syndrome involving autoimmune hepatitis (AIH) and systemic lupus erythematosus (SLE). The patient presented with jaundice, hepatosplenomegaly, malaise, polyarthralgia, arthritis and butterfly rash on the face.
Some of the clinical characteristics of SLE patients observed were nephritis (53.7%), fever (53.26%), neuropsychological disorder (36.18%), malar/butterfly rash (27.6%), pulmonary disorder (22.6%), photosensitivity (21.6%), cardiac involvement (21.1%) and oral ulcers (19.09%). 
Systemic lupus erythematosus and infections: a retrospective study in Saudis.
The prevalence of the following manifestations was significantly higher for pediatric than for adult-onset disease including: lupus nephritis (43% pediatric vs 26.4% for adult-onset), hematological disorders (57% vs 36.4%), photosensitivity (20% vs 9%), butterfly rash (61% vs 35.5%) and mucosal ulceration (11.4% vs 4%). 
Systemic lupus erythematosus (SLE) is a multifactorial autoimmune disease with highest prevalence among women of childbearing age. 
We described a unique case of a 25-year-old Arab young woman who was diagnosed with SLE, depending on clinical, laboratory investigations and after she had fulfilled the diagnostic criteria for SLE and had presented the following findings: constitutional findings (fatigue, fever, and arthralgia); dermatologic finding (photosensitivity and butterfly rash); chronic renal failure (proteinuria up to 400 mg in 24 hours); hematologic and antinuclear antibodies (positivity for antinuclear factor (ANF), anti-double-stranded DNA antibodies, direct Coombs, ANA and anti-DNA, low C4 and C3, aCL by IgG and IgM). 
Grade 1 and 2-3 inflammatory process occurred in 53 (63%) and 31 (37%) patients respectively. Symptom complexes "systemic inflammation", "butterfly rash", "wrist petechiae", "enanthema of the oral mucous membrane", and other lesions were regarded as the markers of SLE activity. 
Systemic lupus erythematosus (SLE) remains a challenging medical problem. 
Rembrandt's Maria Bockenolle has a butterfly rash and digital deformities: overlapping syndrome of rheumatoid arthritis and systemic lupus erythematosus.
A butterfly rash on the patient's face suggested a diagnosis of systemic lupus erythematosus (SLE).
A butterfly rash on the patients face suggested a diagnosis of systemic lupus erythematosus (SLE)
The diagnosis of SLE could be excluded and the butterfly rash attributed to a laminar hemorrhage, an ecchymosis due to the autoimmune thrombocytopenia.
We describe a case of KD who developed a typical butterfly rash, reminiscent of SLE. 
The diagnosis of SLE was made 22 years ago based on Raynaud's phenomenon, butterfly rash, hair loss, photosensitivity and positive antinuclear antibody. 
Symptom complexes "systemic inflammation", "butterfly rash", "wrist petechiae", "enanthema of the oral mucous membrane", and other lesions were regarded as the markers of SLE activity.
Rembrandt's Maria Bockenolle has a butterfly rash and digital deformities: overlapping syndrome of rheumatoid arthritis and systemic lupus erythematosus.
To investigate, various unspecific, but otherwise typical clinical symptoms of skin and mucous membranes that arise in SLE patients other than those defined as SLE criteria such as butterfly rash, chronic cutaneous lupus erythematosus, oral ulcers, and increased photosensitivity.

Answer: Yes, butterfly rash is symptom of Systemic lupus erythematosus.
Exact answer: yes