This is a 12-week clinical study to determine safety, tolerability, and clinical effect of NFX-179 Gel 1.50% Gel in subjects with EN.~At Visit 1 (Screening), the Investigator will select 1 Target EN lesion for treatment that meet the inclusion criteria. A biopsy tissue sample of the Target EN will be taken for histological confirmation of an EN diagnosis if required, to assess p-ERK levels and for genetic testing.~Subjects will be seen at Visit 2 for management of the Visit 1 biopsy wounds.~At Visit 3 (Baseline) eligible subjects will be provided study medication and start the 12-week, QD treatment period. Target EN assessments will be collected.~Subjects will be seen for treatment period visits, Visits 4-7, when Target EN assessments will be collected.~At Visit 8, subjects will be seen for the final treatment period visit. Target EN assessments, a biopsy sample for genetic testing and p-ERK levels will be. Subjects will start a 4-week no-treatment follow-up period.~Subjects will be seen at Visit 9, for management of the Visit 8 biopsy wound.~At Visit 10 (end of study), subjects will be seen for the final study visit and will be discharged from the study.
This study of NFX-179 is an open-label study, evaluating safety, tolerability, pharmacodynamic activity, and the clinical effect in subjects with Epidermal Nevus(ENS). NFX-179 is formulated as a gel for topical administration. NFX-179 has been shown in animal studies and in human extracts to suppress p-ERK with systemic absorption of NFX-179 following topical application to be extremely low, based on serum values observed in animal studies.~Primary objectives:~To determine the pharmacodynamic activity of NFX-179 Gel as defined by suppression of phospho-ERK (p-ERK) levels in Target EN in treatment group after 12 weeks of once-daily (QD) application~To determine the safety and tolerability of treatment with NFX-179 Gel 1.50% applied QD for 12 weeks.~Secondary objectives:~-Clinical effect of NFX-179 Gel 1.5% defined as the percent change in EN volume after 12 weeks of QD application