You most likely are facing swelling of your hands that is induced by an allergy. Allergies develop when the body reacts to a certain stimulus that it doesn't like, which results in swelling. Redness, itching, or even puffiness are the possible symptoms you may get on your hands. The most common causes of allergies can be some foods, insect bites, or even contact with some things. To help with swelling, consider taking antihistamines and avoiding your allergy triggers.

HIV does not spre­ad easily from dried blood. The virus die­s quickly outside the body. A small cut touching dried blood is ve­ry unlikely to cause infection. Unbroke­n skin protects against HIV entering the­ body. Being cautious with blood is wise. Howeve­r, in this case, the chance of ge­tting HIV is extremely low. It's still good to watch for any unusual symptoms. But you probably have­ nothing to worry about!

It appears that you are experiencing symptoms of oral thrush, a condition that causes your tongue to be covered in white. Smoking is one of the major causes of this disease, and so is drinking alcohol or having a weak immune system. The most effective way to deal with it is to reduce smoking and alcohol intake, as well as maintain good oral hygiene. Additionally, drinking more water can also help.

It seems like you’ve done a good job taking care of the metal puncture wound by cleaning and sterilizing it. Because you had a tetanus injection in the past year, you are likely to be immune to tetanus. However, watch for redness, swelling, heat, or pain in the area. If any of these symptoms occur, seek medical attention.