Hi - I Am Nearly 70 And For The Past

Hi - I am nearly 70 and for the past couple of years my arms are bruising with little effort. I may go to sleep with my fingers clasped around one lower arm and will wake up with severe bruises, such as to suggest that someone has held me in a hard grip (3-4 bruises in a row). Even my little poodles, putting a paw on my arm, may leave a serious bruise. I am certainly not an abused wife and don't like looking like one. Is there anything I can do to stop this occurring?