Cosentyx psoriasis treatment autoinjector. Psoriasis is a skin condition where excessive growth of skin cells can lead to itchy, scaly, thickened patches (plaques) of skin which may become infected. Psoriasis is sometimes triggered by emotional stress, some infections or drugs, although often the cause is unknown. This drug, which contains the active ingredient secukinumab, is self-administered by the patient. It is a human monoclonal antibody drug that blocks the cytokine interleukin 17A, which is involved in the inflammatory response.