Sternoclavicular pain in the middle of the clavicle a little protruding a little pressure pain may be related to fractures, bone cysts, exophytic bone warts and other causes. 1. Fracture: If the middle part of the clavicle is fractured due to impact or other injuries, the fracture end may be displaced and the skin surface may protrude a little and there may be pressure pain. 2. Bone cysts: If a bone cyst occurs in the middle part of the clavicle, a lump can be touched, accompanied by pressure pain. 3. exophytic bone warts: generally small exophytic bone warts are asymptomatic, bone warts can gradually grow to protrude from the skin surface, there may be pressure pain.