Inverse psoriasis in Child
Inverse psoriasis affects up to 30% of patients who have plaque psoriasis, and it most commonly presents in the inguinal folds. The external genitalia is involved in up to 80% of individuals with inverse psoriasis.
Lesions may be pruritic, irritated, or painful. Inverse psoriasis is also associated with a decreased quality of life and may adversely impact intimate relationships.
L40.8 – Other psoriasis
238600001 – Flexural psoriasis
Differential Diagnosis & Pitfalls
- Tinea corporis – Will have positive potassium hydroxide (KOH) examination.
- Intertrigo with secondary bacterial infection.
- Candidiasis – "Beefy" red erythema or satellite pustules prompt concern for candidiasis.
- Erythrasma – With "coral red" fluorescence by Wood's lamp examination.
- Seborrheic dermatitis – Can be difficult to exclude, even histologically.
- Hailey-Hailey disease (benign familial pemphigus) – An inherited acantholytic disorder with characteristic histologic findings. Clinically, plaques are more moist and fissuring is often more apparent.
- Darier disease (keratosis follicularis) – An inherited acantholytic disorder with characteristic histologic findings; unusual in the genital area.
- Subcorneal pustular dermatosis (Sneddon-Wilkinson disease) – Annular plaques with pustules along the border and often clear center.
- Impetigo herpetiformis – Occurs during pregnancy; pustules occur at the margins of the lesions.
- Genital lichen sclerosus – Atrophic, blue-white plaques.