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Becker's naevus also known as Becker's melanosis (BM) or pigmented hairy epidermal naevus is a cutaneous hamartoma with brown hyperpigmentation and hypertrichosis. It commonly occurs during adolescence and rarely at birth. It usually affects young post-pubertal males and has a prevalence of 0.5%. A naevus usually consists of a circumscribed, unilateral, irregularly shaped, hyperpigmented spot usually located around the anterior upper body, with or without hypertrichosis and/or acneiform lesions. Sometimes developmental abnormalities can occur with Becker's naevus, which is called Becker's naevus syndrome (BNS). Becker's naevus was of atypical presentation in two patients over the forearm and leg. Hence, these case reports gain importance. [ABSTRACT FROM AUTHOR]

The article presents case study of a 16-year-old boy with Klippel Trenaunay syndrome (KTS) characterized by a swollen right leg with skin lesions. The diagnosis was confirmed through physical examination, cutaneous examination, and ultrasonography, which revealed venous malformation and varicose veins. KTS is a congenital vascular malformation condition that involves hypertrophy of soft tissues and bones in the affected limb.