I responded under your other post but will copy and paste my response here as well.
Hepatitis C can cause Porphyria Cutanea Tarda (PCT). Therefore, if one has Porphyria Cutanea Tarda (PCT), one should be tested for Hepatitis C.
Here are a couple of articles about Porphyria Cutanea Tarda (PCT). They explain the causes, the condition, and the treatment:
There are some people on the forum who have PCT and hopefully they will see your post and respond.