History of Psoriasis: Ancient Egyptian Records to Modern Understanding

Timeline of Psoriasis Recognition

c. 1550 BCE – Ebers Papyrus (Ancient Egypt)

Earliest written medical description of a scaly skin condition resembling psoriasis, treated with herbs, tar, and sunlight.

c. 5000 BCE – Archaeological Evidence

Possible psoriatic lesions on mummies; suggests disease existed millennia before written records.

Classical Antiquity

• Hippocrates (460–370 BCE): Described "psora" (itchy, scaly eruptions) but conflated with leprosy.
• Celsus (1st century CE): Used term "psoriasis" for scaly conditions.

19th Century – Clinical Differentiation

• Robert Willan (1801): First to classify psoriasis as distinct entity (Willan's "lepra graecorum").
• Ferdinand von Hebra (1841): Confirmed separation from leprosy; described Auspitz sign, Koebner phenomenon.

20th–21st Century – Pathophysiology and Treatment Revolution

• 1960s: Epidermal hyperproliferation identified (transit time 4–5 days vs. 28 normal).
• 1970s: Immune involvement discovered (T-cell driven, IL-17/23 axis).
• 1990s–present: Biologics (TNF-α, IL-17, IL-23 inhibitors) transform outcomes.

Psoriasis is among the earliest documented skin diseases, yet its understanding continues to evolve rapidly.