- Liver Diseases
- Overview
- Alcohol-Associated Liver Disease
- Autoimmune Liver Diseases
- Cancer
- Complications of Liver Disease
- Diagnosing Liver Disease
- Fatty Liver Disease (Steatotic Liver Disease)
- Pediatric Liver Information Center
- Overview
- Pediatric Liver Disease
- Alagille Syndrome
- Alpha-1 Antitrypsin Deficiency
- Autoimmune Liver Disease in Children
- Biliary Atresia
- Budd-Chiari Syndrome
- Crigler-Najjar Syndrome
- Galactosemia
- Hepatitis B
- Hepatitis C in Children
- Nonalcoholic Fatty Liver Disease (NAFLD) in Children
- Glycogen Storage Disease Type 1 (von Gierke)
- Primary Sclerosing Cholangitis (PSC) in Children
- Progressive Familial Intrahepatic Cholestasis (PFIC)
- Gilbert Syndrome
- Reye's Syndrome
- Wilson Disease
- Parents
- Liver Disease for Teen and Young Adults
- Kids
- Bili the Brave™ Toolkit
- Video Library
- Liver Terminology
- Rare Disease
- Treatment
- Viral Hepatitis
- About Your Liver
- Health and Wellness
- Resource Center
- How You Can Help
- About ALF
- Mission, Impact and History
- Research Awards Program
- People
- Financial Information
- Policies
- Corporate Policies
- Medical Policies
- COVID-19 Alert Policy
- HCV Screening Recommendations from US Preventative Services Task Force
- Hepatitis A Policy
- Hepatitis C Testing Policy
- Incarcerated Persons
- Needle Exchange Policy
- Organ Donation Policy
- Position on the Use and Care of Animals in Research
- Position Statement on Hepatitis A and Vaccination
- Careers
- Contact Us
Porphyria cutanea tarda (PCT) is a type of porphyria or blood disorder that affects the skin. PCT is one of the most common types of porphyria. It’s sometimes referred to colloquially as vampire disease. That’s because people with this condition often experience symptoms following exposure to sunlight.