What is ParaPsoriasis?

The term "ParaPsoriasis" was formed in 1902.

Parapsoriasis is a group of diseases with external manifestations similar to psoriasis.

These diseases may have some other similarities to psoriasis, but have absolutely different mechanisms and causes than psoriasis.

A uniform definition of parapsoriasis is still lacking.

Common Classifications of Psoriasis and Parapsoriasis

1. Diseases of the Skin and Appendages by Morphology

According to this first classification, psoriasis and parapsoriasis both belong to the following group of the "Diseases of the skin and appendages by morphology":

Rashes / With epidermal involvement / Scaling:

• Psoriasis,
• Parapsoriasis,
• Pityriasis rosea and Pityriasis rubra pilaris,
• Secondary syphilis,
• Mycosis fungoides,
• Systemic lupus erythematosus,
• Icthyosis,
• Tinea ...

Therefore, according to this first classification, morphologically (relating to the shape and form) both psoriasis and parapsoriasis can be characterized as rashes with epidermal involvement, and scaling in particular.

2. Diseases of the Skin and Subcutaneous Tissue

According to another classification, psoriasis and parapsoriasis both belong to the following group of the "Diseases of the skin and subcutaneous tissue"

Inflammatory / Papulosquamous disorders (with both - papules and scales):

• Psoriasis (Psoriatic arthritis),
• Parapsoriasis (Pityriasis lichenoides et varioliformis acuta, Pityriasis lichenoides chronica, Lymphomatoid papulosis),
• other pityriasis (Pityriasis rosea, Pityriasis rubra pilaris),
• other lichenoid (Lichen planus, Lichen nitidus).

Therefore, according to this second classification, both psoriasis and parapsoriasis can be characterized as inflammatory papulosquamous (with papules and scales) disorders.