Il-17 inhibitor in patient with juvenile psoriasis and primary immunodeficiencyTo the Editor, Psoriasis is a chronic inflammatory skin condition commonly accompanied by inflammatory arthritis. 1 We present a case of a 15-year-old patient with juvenile psoriasis in whom autoimmune elements intermingle with immunodeficiency, highlighting the complexities of treatment and the dilemmas encountered in everyday clinical practice.The disease initially manifested with generalized erythematosquamous lesions of varying sizes. Additionally, all the nails were affected, with diffuse thickening of the skin on the soles, erythema, and infiltration (Figure 1A) along with left ankle pain and swelling, dry irritating cough, and low grade fever.Extensive multidisciplinary investigations were conducted, leading to a histological confirmation of the diagnosis of psoriasis vulgaris. The severity of the disease was evaluated using the Psoriasis Area and Severity Index, indicating a score of 45.1, classifying it as severe psoriasis. Ultrasound initially, followed by magnetic resonance imaging, revealed the arthritis of the left ankle.