Occasionally psoriasis of one clinical type may evolve into another such as pustular psoriasis, erythrodermic psoriasis, or guttate psoriasis. Clinical types of psoriasis include the following:
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1. Plaque psoriasis– In plaque psoriasis, there are raised, inflamed, and scaly patches of skin that may also be itchy and painful
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2. Pustular psoriasis– In pustular psoriasis, there are white, pus-filled, painful bumps (pustules) that may be surrounded by inflamed or reddened skin
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3. Erythrodermic psoriasis– In erythrodermic psoriasis, very extensive and diffuse areas of red and scaling skin are present.
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4. Guttate psoriasis– In guttate psoriasis, there are many isolated small, red, round scaling bumps.
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5. Inverse psoriasis– In inverse psoriasis, there is inflamed deep-red skin that is smooth and not scaly
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6. Psoriatic arthritis
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7. Nail psoriasis– In nail psoriasis, there are changes to the fingernails and toenails