Linear Psoriasis: A Rare and Often Underdiagnosed form of Psoriasis in Children

Blaschko-linear psoriasis (PBL) is a rare form of psoriasis that presents as longitudinal lines on the skin, along Blaschko lines. This form of psoriasis is often observed in children and can be difficult to distinguish from other acquired Blaschko linear dermatoses such as inflammatory linear verrucous epidermal nevus (ILVEN) and lichen striatus. The prevalence of PBL is unknown, but it is generally observed in children and is more common in boys than in girls. The clinical and histological similarity of PBL to ILVEN presents a diagnostic challenge. In this case report, we present the case of a 7-year-old child with PBL and discuss the diagnostic and therapeutic aspects of this rare form of psoriasis. We were able to confirm the diagnosis of PBL after treatment with white petroleum jelly and salicylic acid petroleum jelly 5% resulted in a significant improvement of the lesions. Topical treatments, phototherapy, and systemic medications can be used in the case of PBL. It is important to select the most appropriate treatment based on the severity of the lesions, the location, and the patient's tolerance, and to keep in mind that PBL can have long-term effects on the quality of life of patients and their families.