The emergency services were called to to an incident, in Berrisford Road, in Market Drayton, shortly after 10.45am on Thursday.
In a statement West Midlands Ambulance Service said: "On arrival we discovered one patient, a woman, who had an unknown substance thrown at her.
"She received treatment at the scene before being transported to Princess Royal Hospital for further assessment."
A crew from Market Drayton Fire Station and West Mercia Police also attended the scene.
Shropshire Fire & Rescue Service said the incident involved "a chemical substance causing burning to hands".