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Le psoriasis peut-il s'infecter ?

Can psoriasis become infected?

Psoriasis is characterised by the emergence of red inflammatory patches accompanied by white scales. These lesions cause itching and pain that can impact the patient's quality of life. If not properly managed, can this disease become infected or experience complications? The answer is provided in this article.

Published February 20, 2024, by Manon, Scientific Editor — 3 min read

Psoriasis in a nutshell.

The psoriasis is a skin disease that is recognised by the red and scaly patches that cover specific parts of the body. These can be a source of itching and irritation, their intensity varying from one individual to another. They appear following a skin inflammation caused by a failure of the immune system. The T lymphocytes produce inflammatory molecules (IL-17, IL-22, TNF-α, among others). These stimulate the proliferation of keratinocytes. The renewal period of these cells, normally three weeks, then becomes three days. This results in an accumulation of immature keratinocytes on the skin surface, increasing the thickness of the outer layer (the cornea). This is referred to as hyperkeratosis.

Can psoriasis become infected?

Psoriasis presents patches and skin lesions that are susceptible to infection.

  • Fungal infections.
    When psoriasis affects the skin folds or moist areas of the skin, it creates an environment conducive to fungal growth. This can lead to fungal infections such as candidiasis. Notably Candida spp has been found to exacerbate psoriasis by secreting toxins.

  • Bacterial infections.
    Psoriasis plaques can cause cracks or skin lesions, thereby creating entry points for bacteria, particularly streptococci and staphylococci. This can lead to secondary bacterial infections such as impetigo, folliculitis or abscesses.

What to do in case of an infected psoriasis?

At present, there is no treatment that can cure psoriasis. However, following a medical consultation, a variety of treatments can help to alleviate symptoms. The choice depends on the type of psoriasis to be treated, the patient's age, and their overall health. Generally, ensuring the well-being of the skin is essential to relieve the lesions caused by psoriasis. To do this, it needs to be moisturised and protected from extreme temperatures. Care must be adapted to sensitive skin. Ideally, one should opt for cleansing products with a neutral pH. No product containing alcohol should be applied to skin with plaques. Scratching or rubbing should be avoided as much as possible in case of itching. If the itching becomes unbearable, the application of ice can provide relief.


  • TENG Y. & al. Infection-provoked psoriasis: Induced or aggravated (Review). Experimental and Therapeutic (2021).


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