What is the reason for my arm pain?

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1. There is a possibility that there may have been multiple attempts at the same site before taking the blood sample.
2. This causes extravasation of blood in the surrounding tissues as well leading to hematoma formation often accompanied by discoloration of the skin.
3. This may also cause an increase in compartment pressure (caused when pressure builds up within the muscle) causing pain especially while stretching.
4. You may use hot fomentation locally over the site for 15 minutes each thrice a day. Definitely, you will be benefitted from this.