My lip on my mouth swollen.. it starts out itching then it swells please help it's embarrassing cause it's on one side?

Angioedema: This is an allergic reaction to something internal or external and you have to try eliminating one thing at a time in an attempt to find the culprit which may be a food, temperature,makeup,etc. Taking an antihistamine like benadryl(causes drowsiness) or Claritin (loratadine) usually helps the angioedema recede or prevents it. See an allergist if symptoms persist.