Psoriasis - Causes

Introduction Causes Symptoms Treatments

Causes of Psoriasis The exact cause of psoriasis is unknown, but it is believed that a combination of factors contributes to the development of the disease. An abnormality in the immune system causes inflammation in the skin, triggering new skin cells to develop too quickly. Normally, skin cells are replaced every 28 to 30 days. With psoriasis, new cells grow and move to the surface of the skin every three to four days. The buildup of old cells being replaced by new cells creates the silver scales of psoriasis.

Psoriasis Outbreaks are caused by No one knows what causes psoriasis outbreaks. The severity and frequency of outbreaks vary with each person. Outbreaks may be triggered by:
Skin injury (for example, cuts, scrapes, or surgery)
  • Emotional stress
  • Strep infections