Psoriasis is an autoimmune disease that causes skin cells to multiply up to 10 times faster than normal. There is a wide spectrum of severity and manifestations of psoriasis, but common characteristics of most types of psoriasis include skin redness (erythema), thickening, and scaling (squamae).

Symptoms of psoriasis range from pinhead-sized spots on the skin to major eruptions that cover large areas of skin. Symptoms most commonly occur in cycles, flaring for a few weeks or months, then subsiding or going into remission; however, it may also be monophasic, meaning symptoms only occur once. It is possible to have more than one type of psoriasis.

Types of psoriasis include:

  • Plaque psoriasis
  • Nail psoriasis
  • Scalp psoriasis
  • Oral psoriasis
  • Linear psoriasis
  • Napkin psoriasis
  • Guttate psoriasis
  • Inverse psoriasis
  • Pustular psoriasis
  • Erythrodermic psoriasis
  • Psoriatic arthritis
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