Normally a rash is caused by a
titanium piece-usually
jewelry touching the skin. An implant usually does not cause a localized allergic reaction. IT can either cause a generalized rash, or a burning sensation, listlessness, pain at the site or even a feeling of extreme fatigue, low grade fever etc. Again titanium implant allergy is rare. However, do consult your doctor for clarification. In all probability it is some other allergy or dermatitis, or eczema.