Fig. 1From: Congenital anomalies-associated Riga–Fede disease as an early manifestation of Lesch–Nyhan syndrome: rare entities in the same pediatric patient—a case reportClinical presentation of the patient at eight months of age. A An ulcer involving the tip of the tongue with well-defined regular borders and a yellowish central membrane. The lower lip exhibits deformity. Erythematous patches in the perioral skin is noted. B A deformed lower lip with an extensive ulcer involving both the oral mucosa and vermillion lip border. The ulcer has well defined regular borders and a central yellowish membrane. A white halo surrounds the ulcer borders indicating hyperkeratosisBack to article page