Background: Pachyonychia congenita (PC) is a rare keratinization disorder with around 1,000-10,000 cases reported worldwide. The mutation involves: KRT6A, KRT6B, KRTC6C, KRT16 or KRT17. Patients present severe plantar pain, palmoplantar keratoderma underlying blisters, and variable hypertrophic nail dystrophy [1]. Visual Analogue Scale (VAS) measures pain intensity. VAS consists of two endpoint...