Cosentyx is a medication that is used to treat various autoimmune diseases such as psoriasis, psoriatic arthritis, and ankylosing spondylitis. While it is generally considered safe and effective, some potential side effects have been reported. According to Medical News Today [2], common side effects of Cosentyx include infections, diarrhea, and flu-like symptoms. More severe side effects can include allergic reactions, liver damage, and exacerbation of existing infections such as tuberculosis.

There is no evidence to suggest that Cosentyx causes long-term skin damage. However, it is important to note that some patients may experience skin irritation or rash as a side effect of the medication [3]. This is typically a temporary side effect that resolves on its own or with the use of topical treatments.

In conclusion, while Cosentyx can cause side effects, there is no evidence to suggest that it causes long-term skin damage. Patients who are considering taking Cosentyx should discuss the potential risks and benefits with their healthcare provider [1]. If any concerning side effects occur, patients should seek medical attention immediately.

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/tradename/COSENTYX
[2] https://www.medicalnewstoday.com/articles/drugs-cosentyx-side-effects
[3] https://www.healthline.com/health/drugs/cosentyx-side-effects