I have a cyst or abcess on arm. no redness, a little swelling. my whole arm burns & feels weak like i exercised it too much. what should i do?

See your doctor!: This can only be diagnosed by an exam. First of all, an infection must be excluded and some infections can become life-threatening, if caused by certain types of bacteria. Severe pain (often with fever) can be a sign of infection. Also, you did not mention the location of the cyst or abscess but a swelling that causes burning or weakness might be compressing a nerve. So have this looked at asap!