Hygromas result out of mechanic trauma of this region in younger dogs of bigger breeds and are not genetic. Aspiration mostly gives the results Massimo wrote of and the risk of bacterial infection. In my experience it is best to sew two cussions into the arms of a shirt and let the dog wear that shirt for a while to avoid former trauma. In most cases they dissapear by themselve when the dog gets older and/or the traumatic reason dissapears.
Surgery has a big risc of not healing sutures and ifektion and should only be used in very few cases.
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