See here in FA 2020 for a list of extrahepatic manifestations in HepC and HepB. Importantly HepC can induce essential mixed cryoglobulinemia. It presents with palpable purpura in association with arthralgia and peripheral neuropathies caused by immune-complex type III hypersensitivity mediated vasculitis.
The triad is weakness, arthralgia, and palpable purpura. Keep in mind peripheral neuropathy, hematuria, and hepatosplenomegaly and most importantly, Hepatitis C.