Hello Doctor, For the past 2 months I ve been noticing a bruise on my inner left arm. It comes and goes every week or so, in the exact same spot and size. It is dark, slightly raised and sore. Could this be a symptom of some type of medical condition or am I likely hitting the same spot on something without noticing? FYI I don t take any medications and haven t had any significant lifestyle changes lately, but I do chew nicotine gum. Any information you could provide would be appeciated. Thank you, Alana