A 69 year old edentulous alcoholic male who lives alone is admitted to the hospital for evaluation of a shoulder wound that is not healing well. On physical examination, numerous ecchymoses are noted on the posterior aspect of his legs and thighs. Careful examination of the man's skin reveals minute hemorrhages around hair follicles and splinter hemorrhages in the nail beds. Laboratory examination is remarkable for a hemoglobin of 10 (normal 14-18 g/dL); no other hematologic abnormalities are noted. Therapy should consist of ?