Welcome to HCM,
It seems that you might be having some allergy
due to taking some thing by mouth as it appeared on lip and throat as well.
Nothing to worry.
Take some anti-allergy medicine like Tab Cetrizine
or Levo-cetrizine as and when required.
Avoid possible allergen if known to you.
It might be due to Kneller wrap due to synthetic material.
Ok and bye.