Psoriasis vs. Atopic Dermatitis: The Difference

Psoriasis and atopic dermatitis are both chronic inflammatory skin diseases. This article aims to briefly summarize the comparisons and distinctions between these two conditions.

Dainichi, T., Kitoh, A., Otsuka, A., Nakajima, S., Nomura, T., Kaplan, D. H., & Kabashima, K. (2018). The epithelial immune microenvironment (EIME) in atopic dermatitis and psoriasis. Nature Immunology, 19(12), 1286–1298. doi:10.1038/s41590-018-0256-2

The above study discusses The epithelial immune microenvironment (EIME) in atopic dermatitis and psoriasis. EIME is a term that describes how the skin's immunological profile is expressed in a pathological state. Various structures interact to form the skin barrier function and maintain immunological balance, thereby fulfilling the skin's physiological functions. If this balance is disrupted, various inflammatory skin diseases such as atopic dermatitis and psoriasis can occur.

Differences between Atopic Dermatitis and Psoriasis

• Atopic dermatitis is characterized by moist inflammation, accompanied by exudate/oozing, and severe itching.
• Psoriasis involves raised, dry scales and is less itchy.

Atopic dermatitis primarily occurs in childhood and has a high prevalence up to the 20s and 30s. In contrast, psoriasis often develops from the late 30s onwards, making it more common in middle age.

Regional Differences

Atopic dermatitis primarily appears on the face, while psoriasis commonly appears on the scalp. However, it can also manifest in atypical areas depending on the case.

Causes and Treatment

Atopic dermatitis is primarily explained by allergic hypersensitivity reactions, whereas psoriasis emphasizes an autoimmune aspect. Pruritus is challenging to manage in chronic cases, and symptoms can worsen due to irritation. Therefore, alleviating and controlling pruritus are crucial in treatment.

Genetic Susceptibility and Spectrum

Depending on the individual, symptoms may manifest as atopic dermatitis or psoriasis, but generally, the two diseases do not appear together. There are attempts to categorize atopic dermatitis into subtypes and systematize them, considering conditions such as psoriasis, Asian atopic dermatitis, and European atopic dermatitis.

Conclusion

In the treatment of chronic skin diseases, the following goals must be addressed:

• Pruritus management
• Resolution of local inflammation
• Skin barrier restoration
• Correction of immune profile imbalance

By achieving these goals, favorable treatment outcomes can be achieved.