causes of unexplained bruising. Try taking iron tablets and multivitamins for some days and see if the symptoms improve. If the symptoms do not improve, get yourself evaluated by a physician and look out for SLE
, liver diseases or leukemias. Anti-clotting (anti-coagulants) medication also can cause increased bruising. Thyroid disease has no relation with this.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.