Psoriasis is a long-lasting skin disease that can return at any time. The name derives from Greek psoriasis which is ‘itch’. It is not a catching disease.

Factors promoting psoriasis include:

  • Metabolic disorders
  • Endocrine conditions
  • Mental injures
  • Psychological injury
  • Genetic reasons

It may form in any place on skin: knees, elbows, scalp, or lower back.

The course of the disease may be put into three stages.

  • Progressive (papules form and grow)
  • Permanent (they are constantly seen)
  • Regressive (papules disappear)

Occasionally, psoriasis affects nails. Sometimes, swollen and tender joints occur, which may be a symptom of arthropathic psoriasis, also known as psoriatic arthritis.