“Chik Sign” as a Distinctive Marker of Post-Chikungunya Hyperpigmentation: A Report of Two Cases

Abstract

Chikungunya (CKG) is an arboviral, mosquito-borne disease transmitted by Aedes mosquitoes, characterized by fever, joint pain, and various cutaneous manifestations. A notable cutaneous feature following CKG infection is “Chik Sign,” or hyperpigmentation around the nose, which often appears after the acute phase of the illness. This report presents two cases of post-CKG hyperpigmentation (Chik Sign), detailing clinical presentation, diagnostic evaluation, and management. Both patients developed facial pigmentation localized to the nasal and periorbital regions following a history of fever and polyarthralgia. Laboratory tests confirmed the diagnosis of CKG, and conservative management led to recovery. The report emphasizes the clinical significance of Chik Sign as a diagnostic clue in resource-limited settings and provides a differential diagnosis for similar pigmentary changes.