Really sore spot on my tricep making my arm sore?

Strain vs bruise: Pain and soreness about your triceps is most likely do to an injury or overuse problem. You can sustain a bruise with direct blunt trauma, a partial tear or strain with resisted force injury (too heavy a weight or too many repetitions past point of fatigue). A thorough orthopaedic evaluation is warranted if your symptoms are not steadily resolving over the course of a week.