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.