If you have a lump, it makes sense to start with your primary care provider. They can do the initial history, physical, and testing to find out what, if any, specialty care makes the most sense.
maybe, see a doctor
no, it could be anything, swollen lymph node, damaged tissue, could also be benign - you still need to go to doctor though to get it checked.
Check for any lump, and continue checking every month. If there is a lump, go to a doctor, now! Pain could be caused by many things. If the pain is still there, go to a doctor, and you can have him/her do some tests.
If you have a mosquito bite that makes your arm need, you should see a doctor immediately. You may be severely allergic, or the insect may have transmitted a disease.
no it is part of your bone
You will need to see a doctor to get a diagnosis on your shaky arm. The doctor can help you decide a course of treatment.
The lump may be related to the injury or to the healing process. It may persist for weeks. If you have any pain or the lump gets larger, consult a physician for treatment.
Injecting to fast
you get a small lump and the itching feeling due to an allergic reaction to the mosquito saliva.
That will depend on the sport, how physical it is, and how badly broken your arm was. Certainly months, but you'd need a doctor's opinion.
It could be ringworm, bug-bite, or something else...
Something for your medical practitioner to look at