What does a itchy painful bump on my arm mean?

Shimmy <33

New member
A couple of weeks ago I had a big bump on my leg that itched for a while and then became very painful and made my whole leg ache. It became so painful I had to skip school for a while. Now I have another similar bump on my arm and I am experiencing the same symptoms. My sister also had this a couple days ago. I know it's not bed bugs, fleas, or lice. But I have no idea what it is or how to treat it and would really appreciate some help.
 
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