Side Effects a Year After Cheek Filler?

A year after voluma, 1 cheek continues to have side effects. From day 1 ive had hardness, mild throbbing & a feeling of mild cramping, intermittently. On touch, there's palpable hardness, like hard ridges deep under the skin constantly. Dr. said it will improve. Got a 2nd opinion, and dr suggested symptoms may be due to injector hitting an artery causing necrosis and resultant scar tissue causing the hardness. Is this necrosis as theres no skin discoloration? If so, what corrections can be done?

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