Diagnosis: Inverse (intertriginous) psoriasis
A 45-year-old male presents with smooth, glossy erythema in the axillae and inguinal folds, persisting for several months. The lesions are well-defined and devoid of scale, causing significant discomfort and pruritus. This case highlights the atypical presentation of a common dermatological condition, emphasizing the importance of recognizing inverse forms of skin disease.
A 45-year-old male with a history of psoriasis presents with smooth, glossy erythema in the axillae and inguinal folds, which has been present for approximately six months. The patient reports significant discomfort and intermittent pruritus in these areas. On examination, the lesions are well-defined, erythematous, and devoid of scale, contrasting with typical psoriatic plaques.Location: Involvement of intertriginous areas, specifically axillae and inguinal folds.Appearance: Smooth, shiny erythema without scale.Symptoms: Associated itching and discomfort.Border: Well-defined edges.Duration: Persistent for several months.
The patient notes that the onset of lesions began after a period of increased stress and weight gain. He denies any recent changes in medications or significant skin trauma. Previous treatments for generalized psoriasis included topical corticosteroids and vitamin D analogs with limited success. No family history of psoriasis or other autoimmune diseases is noted. The patient is a non-smoker and does not consume alcohol.Onset: Lesions began following stress and weight gain.Prior treatments: Topical corticosteroids and vitamin D analogs.Medical history: History of generalized psoriasis.Family history: No family history of psoriasis.Social history: Non-smoker, no alcohol use.
Acute / First-Line ManagementTopical corticosteroids: High-potency corticosteroids (e.g., clobetasol propionate 0.05% ointment) applied twice daily.Topical calcineurin inhibitors (e.g., tacrolimus 0.1% ointment) can be used as an alternative, especially in sensitive areas.Emollients: Regular application of emollients to maintain skin hydration and barrier function.Workup and Diagnostic ConfirmationClinical examination to assess the extent and characteristics of the lesions.Consideration of skin biopsy if the diagnosis is uncertain or if there is a concern for alternative diagnoses.Long-Term ManagementSystemic therapies may be considered for moderate to severe cases, including methotrexate or biologics targeting IL-17 or IL-23.Regular follow-up to monitor treatment response and adjust management as necessary.Patient education on the chronic nature of psoriasis and the importance of adherence to treatment regimens.
Intertrigo: Inflammation in skin folds, typically characterized by a moist, eroded appearance and secondary infections; does not typically present with the well-defined borders seen here.Fungal infection: Tinea cruris or candidiasis can mimic inverse psoriasis but usually presents with scaling and may have a different distribution; KOH prep can aid in diagnosis.Contact dermatitis: Allergic or irritant dermatitis may occur in intertriginous areas; history of exposure to irritants or allergens is key for differentiation.Inverse lichen planus: Characterized by shiny, violaceous papules, but typically presents with more papular lesions than the smooth erythema seen here.Seborrheic dermatitis: May present with erythematous patches in skin folds but typically has a greasy scale and a different distribution.Granuloma annulare: Presents as annular plaques, often asymptomatic; lesions are typically more papular than flat.Psoriatic erythroderma: Involves widespread erythema and scaling, but would not be limited to intertriginous areas.Behçet's disease: Can cause skin lesions in folds, but associated systemic symptoms and oral ulcers would be present.
High-Yield PearlsInverse psoriasis: Often presents in intertriginous areas, characterized by smooth, glistening erythema without scale.Diagnosis: Clinical diagnosis is typically straightforward; however, awareness of differential diagnoses is crucial for effective management.Topical management: High-potency topical corticosteroids are effective; calcineurin inhibitors can be used for sensitive areas.Systemic therapy: Consider systemic treatments for more extensive disease or failure of topical therapies.Patient education: Chronic condition management and adherence to treatment are vital for control and prevention of flares.Recognizing the atypical presentations of psoriasis is essential for effective diagnosis and management.
Tags: psoriasis, inverse, intertriginous