<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by Naegeli-Franceschetti-Jadassohn syndrome/dermatopathia pigmentosa reticularis ? [/INST] NFJS/DPR is a rare condition; its prevalence is unknown. Only a few affected families have been reported in the medical literature. </s>