soriasis is an autoimmune disorder of the skin characterized by dry skin and raised, rough, red areas on the skin covered with fine silvery scales. Psoriasis is a non-infectious disease.Attacks are more common in winter than summer; the eruptions have a natural tendency to clear up with the warm weather.

Causes like Psychogenic factors increase the psoriasis – Positive emotions can enhance the immune system, while negative emotions can suppress it. Loneliness, anger, trauma, relationship problems, post-traumatic stress, infections last longer, sexual stress, stress disorder which are negative emotions will elevate levels of the stress hormones.Normally your skin sheds its layers every 25-30 days. In psoriasis the affected lesions shed ever 3-4 days resulting in a buildup of silvery scales.

Types of Psoriasis

1. Plaque Psoriasis: Characterized by hard, red, raised patches on the skin that have a silvery white, scaly coating, well-defined patches are referred to as plaques, and they usually start as small red bumps.
2. Guttate Psoriasis: Drop-like dots, occurs after sterpto. Or viral infection, occurs in young adults and childrens.
3. Pustular Psoriasis: Pus-like blisters, non-infectious, fluid contains white blood cells.
4. Inverse Psoriaisis: Occurs in folds of the skin,armpits, groins, under breasts.
5. Nail Psoriasis: Seen on toenails and fingernails, starts as numerous pits, at time progresses to yellowing, crumbly and thickened nail, nails may slough.
6. Palmar/Plantar psoriasis: Erythema, thickening and peeling of the skin, blistering is often present, can lead to disability.
7. Scalp Psoriasis: Plaque type lesions, esp in occiput, scaling firmly adherent to scalp and assoc. with hair fall.