Hi, I been having unexplained bruising around arms and thighs.I went to dr and had check up done that included blood clotting disorders, liver, hepatitis etc everything was normal. I continue to have unexplained bruises, just now one of the bruises its very painful. I could easily say I got over 5 bruises around thighs and like 3 on my arms. What could ne the cause of the unexplained bruising? I also have some dizziness at times when I lower my head anf memory loss. Im only 26 yrs old. Nothing at all seemed abnormal in routine lab test but the good cholesterol levels that were little low.