Hi thanks for asking question. Here are few possibilities. 1.First if area over implant or skin over chest found red and inflammed then myositis or costochondritis may be under suspicion.ribs are painful on touch if infection of it.for infection antibiotic needed. 2.Second it could be simple muscular pain.Take analgesic for its relief.take rest over bed in supine position.Avoid heavy exertion. 3.Third if you have associated cough, cold , headache, sore throat like symptoms it could be viral infection .Symptomatic management done for it. If inflammation is severe over skin antiinflammatory drugs needed. I hope my suggestion will helpful to you