Aysha Rafi had a sting or a bite - she is not sure which - on her foot on Friday.
Over the weekend she noticed it swell up and by Tuesday it was throbbing to the point of severe discomfort.
This afternoon she went to a walk-in service which is part of a Boots pharmacy in Birmingham city centre.
Nurses there said she should come to A&E because the swelling was moving around the foot and away from the initial sting.
Aysha is now waiting to see a triage nurse.