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Psoriatic erythroderma can be congenital or secondary to an environmental trigger. [12] [13] [14] Environmental triggers that have been documented include sunburn, skin trauma, psychological stress, systemic illness, alcoholism, drug exposure, chemical exposure (e.g., topical tar, computed tomography contrast material), and the sudden cessation of medication.
Psoriatic erythroderma (erythrodermic psoriasis) involves widespread inflammation and exfoliation of the skin over most of the body surface, often involving greater than 90% of the body surface area. [18] It may be accompanied by severe dryness, itching, swelling, and pain. It can develop from any type of psoriasis. [18]
Erythroderma is generalized exfoliative dermatitis, which involves 90% or more of the patient's skin. [3] The most common cause of erythroderma is exacerbation of an underlying skin disease, such as Harlequin-type ichthyosis, psoriasis, contact dermatitis, seborrheic dermatitis, lichen planus, pityriasis rubra pilaris or a drug reaction, such as the use of topical steroids. [4]
Large plaque parapsoriasis are skin lesions that may be included in the modern scheme of cutaneous conditions described as parapsoriasis. [2] These lesions, called plaques, may be irregularly round-shaped to oval and are 10 cm (4 in) or larger in diameter. [2]
Small plaque parapsoriasis characteristically occurs with skin lesions that are round, oval, discrete patches or thin plaques, mainly on the trunk. [2]: 452 [3]: 207 [4]
Parapsoriasis refers to one of a group of skin disorders that are characterized primarily by their resemblance to psoriasis (red, scaly lesions), rather than by their underlying cause.
Psoriatic arthritis tends to appear about 10 years after the first signs of psoriasis. [3] For the majority of people, this is between the ages of 30 and 55, but the disease can also affect children. The onset of psoriatic arthritis symptoms before symptoms of skin psoriasis is more common in children than adults. [48]
Erythema toxicum neonatorum (erythema toxicum, toxic erythema of the newborn) Granuloma faciale; Hypereosinophilia; Hypereosinophilic syndrome; Incontinentia pigmenti (Bloch–Siemens syndrome, Bloch–Sulzberger disease, Bloch–Sulzberger syndrome) Itchy red bump disease (papular dermatitis) Juvenile xanthogranuloma; Kimura's disease