That's blood stasis. The more intense the exercise, the larger the area of blood stasis, which leads to rain and snow. Local swelling of puncture site after blood donation is a common adverse reaction of blood donation. In severe cases, the donor's forearm is swollen and painful, and his limbs are limited.

This is due to improper compression and hemostasis after blood collection and needle removal by blood donors, which leads to subcutaneous congestion. Don't be nervous when there is subcutaneous congestion. While strengthening needle eye care to prevent needle eye infection, cold water bag or ice bag can be used to prevent bleeding within 48 hours after blood donation, and then hot compress with hot water bag can promote the absorption of congestion. You may have had adverse reactions, but you can use,,,,, and you won't get congestion when you exercise vigorously.