Short answer · Medically reviewed summary · Last updated: 2026-04-06

Psoriasis is considered a multifactorial condition, meaning it is influenced by a complex interplay of multiple genetic variations and environmental triggers rather than being caused by a single hereditary gene mutation. Understanding the Genetic Architecture While Psoriasis is not strictly "hereditary" in the sense of a simple Mendelian pattern (like cystic fibrosis), it does run in families. We categorize this as polygenic, involving dozens of susceptibility loci, most notably those within the HLA (Human Leukocyte Antigen) region on chromosome 6.

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Is Psoriasis hereditary?

Name: Is Psoriasis hereditary?
Creator: DiseaseMaps Editorial Team
Published: 2015-06-11UTC09:16:50.0000000

Is Psoriasis hereditary? The genetic component explained in plain language, reviewed against medical sources, with patient experiences.

Understanding the Genetic Architecture

While Psoriasis is not strictly "hereditary" in the sense of a simple Mendelian pattern (like cystic fibrosis), it does run in families. We categorize this as polygenic, involving dozens of susceptibility loci, most notably those within the HLA (Human Leukocyte Antigen) region on chromosome 6. Because Psoriasis is multifactorial, it does not follow autosomal dominant or recessive inheritance patterns; instead, the risk is determined by the cumulative effect of inherited genetic predispositions combined with external factors like stress, injury, or infections.

Risk and Genetic Counseling

If one parent has Psoriasis, the estimated risk for a child is approximately 10%; if both parents are affected, that risk can rise to approximately 50%. However, because the disease is multifactorial, these percentages are statistical estimates rather than diagnostic certainties. Genetic testing is currently not used in clinical practice to diagnose Psoriasis or predict its onset, as the genetic markers identified so far do not have high enough predictive value to change clinical management.

Planning for Families

For families concerned about the transmission of Psoriasis, genetic counseling can be a valuable resource to discuss these risks and help manage expectations regarding the unpredictable nature of the condition. De novo mutations are not considered a primary driver of this disease; rather, the condition is typically passed down as a polygenic predisposition. Because the inheritance is complex, carrier testing and prenatal diagnosis are not standard medical practices for this condition. Our goal as genetic counselors is to provide a clear understanding of these risks while emphasizing that a genetic predisposition does not guarantee the development of the disease.

Disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.