Can psoriasis cause an infection of the bones?

Psoriasis is a chronic inflammatory disease. Immune cells attack the skin, causing visible, uncomfortable lesions. It is an autoimmune condition: the immune system, which is your defense against foreign microbes and chemicals, mistakenly starts attacking your own tissues. Psoriasis does not cause bone infections. However, people that need psoriasis treatment with drugs that block immune system function, they are at increased risk of infection. Bone infection would be rare but could happen.