Diagnosis: Subacute cutaneous lupus erythematosus
A 35-year-old female presents with a 3-month history of annular plaques on her upper back, exacerbated by sun exposure. Physical examination reveals photodistributed, erythematous plaques with central clearing, consistent with a classic presentation of subacute cutaneous lupus erythematosus. Further evaluation is warranted to confirm the diagnosis and assess systemic involvement.
A 35-year-old female presents with a 3-month history of asymptomatic, annular plaques on her upper back. The lesions are exacerbated by sun exposure, leading the patient to seek evaluation. On examination, there are multiple erythematous plaques with central clearing and a distinct photodistribution.Age: 35 years old female.Duration: 3 months.Lesions: Annular plaques with central clearing.Distribution: Photodistributed on the upper back.Symptoms: Asymptomatic, no pruritus or pain.
The patient reports that the lesions began approximately 3 months ago, coinciding with increased sun exposure during outdoor activities. She denies any prior history of similar skin lesions or systemic symptoms such as joint pain or fatigue. There is no significant family history of autoimmune diseases, and she has not been on any medications that could induce photosensitivity. Social history is notable for occasional sun exposure without sun protection.Onset: 3 months ago, following increased sun exposure.Triggers: Outdoor activities without sun protection.Past medical history: No prior skin conditions or autoimmune diseases.Family history: No known autoimmune diseases.Social history: Occasional sun exposure, no sunscreen use.
Acute / First-Line ManagementTopical corticosteroids, such as triamcinolone acetonide 0.1%, applied to affected areas twice daily.For extensive lesions, consider hydroxychloroquine 200-400 mg daily, monitoring for side effects.Patient education on sun protection, including broad-spectrum sunscreen with SPF 30 or higher.Workup and Diagnostic ConfirmationComplete blood count and comprehensive metabolic panel to assess for systemic involvement.Antinuclear antibody (ANA) testing, with a focus on anti-Ro/SSA and anti-La/SSB antibodies.Skin biopsy of an active lesion may be warranted to confirm the diagnosis histologically.Long-Term ManagementContinued use of topical corticosteroids as needed for flares.Regular follow-up appointments to monitor for potential systemic disease.Encourage ongoing sun protection measures to prevent exacerbation of skin lesions.
Psoriasis: Characterized by well-defined, silvery scales and typically affects extensor surfaces, unlike the annular plaques seen here.Dermatomyositis: Presents with heliotrope rash and may have associated muscle weakness; skin findings are distinct from this case.Discoid lupus erythematosus: Typically presents with scarring lesions, primarily on the face and scalp, rather than annular plaques on the back.Granuloma annulare: Presents with annular lesions but lacks the erythematous and photodistributed characteristics of this case.Contact dermatitis: Would usually present with pruritus and a more localized distribution, often associated with identifiable allergens.Drug-induced photosensitivity: Medications such as thiazides or tetracyclines can cause similar skin changes, but the patient denies any relevant medication history.Actinic keratosis: Characterized by rough, scaly patches on sun-exposed skin, but lacks the annular configuration.Viral exanthems: Such as those seen in herpes simplex or varicella-zoster, which are typically vesicular rather than annular in nature.
High-Yield PearlsPhotodistribution: Subacute cutaneous lupus erythematosus is characterized by photodistributed lesions, often exacerbated by sun exposure.Annular plaques: The presence of annular plaques with central clearing is a classic presentation, helping differentiate it from other skin conditions.Systemic assessment: Always evaluate for systemic lupus erythematosus features in patients with cutaneous manifestations.Sun protection: Emphasizing the importance of sun protection can significantly reduce flare-ups and improve patient outcomes.Biopsy: Skin biopsy can provide definitive diagnosis and help rule out other conditions.Subacute cutaneous lupus erythematosus emphasizes the importance of recognizing photodistributed skin lesions in the context of systemic disease.
Tags: SCLE, lupus, photodistribution