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Pain and swelling after a misplaced injection are common, similar to how your knee swells after an injury. The needle may have injured a nerve or tissue, causing the discomfort. You can apply a cold pack to reduce swelling and take a painkiller for relief. If the pain and swelling persist or worsen, see a doctor. 

Got pricked by a sharp needle? Bleeding? You might need a tetanus shot. Dirt can harbor bacteria that cause tetanus, which enters through cuts and wounds. Symptoms include stiff muscles and spasms. A tetanus shot can prevent the illness. Consult with a doctor to be safe.

HIV is a virus that can be transmitted by blood. Acknowledging the low probability of contagion in your case, because the wound is almost healed. In case you get some symptoms like fever or body aches, then don't be scared it doesn't mean that you have AIDS. 

The risk of HIV or Hepatitis B infection from the scenario you told me about is extremely low. HIV and Hepatitis B are primarily transmitted through the infection of the blood of the infected persons. The symptoms may include being feeble, jaundice, or flu-like symptoms. 

It’s common to feel concerned if your scrotum enlarges after gallbladder surgery. This condition, known as a hydrocele, occurs when fluid accumulates around the testicle. It happens because your body needs time to absorb the fluids used during the surgery. Fortunately, most hydroceles resolve on their own within a few weeks. However, if the condition persists or causes discomfort, consult your doctor. They can recommend treatments such as draining the fluid or surgery if necessary and will guide you to the best option.

I understand you’re worried about the bump at the site of your tetanus shot. It’s normal to have a bump there, and it might take some time to heal. Your immune system is reacting to the vaccine as if it were a foreign substance. If there’s no pain or redness, it’s usually not a cause for concern. Just be patient, and the bump should go away on its own. However, if you notice any unusual symptoms, it's best to seek medical advice.