Familial pityriasis rubra pilaris is a rare condition. Its incidence is unknown, although the familial form appears to be the least common type of pityriasis rubra pilaris.
How many people are affected by familial pityriasis rubra pilaris ?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: How many people are affected by familial pityriasis rubra pilaris ? [/INST] \n Familial pityriasis rubra pilaris is a rare condition. Its incidence is unknown, although the familial form appears to be the least common type of pityriasis rubra pilaris.</s>