These steps may be of help after the venipuncture: - Leave the pressure dressing on for at least 8 hours. - Do not take aspirin or ibuprofen for 72 hours - Avoid lifting heavy objects with the arm - Apply ice packs, wrapped in a cloth, to the affected site for approximately 20 minutes one or more times during the first 24 hours following the formation of the bruise or hematoma. - You may apply warm, moist compresses to the site for 20 minutes one or more time during the second 24 hours after the collection. - If you notice any of the following complications visit the ER at the earliest: Discoloration of the hand Additional swelling Generalized pain or discomfort of the arm Throbbing of the arm Numbness in the arm