Pizza Hut and other companies such as KFC, McDonalds, Spar, Post Office, Carphone Warehouse, Shell and Ladbrokes all use a company called Gapbuster.
You can sign up for free and if accepted you can search for mystery shopping opportunities local to you. You basically get to eat for free and have to submit a report online.
It has now almost completely healed, just the skin is slightly more pink, but it doesn't hurt anymore. Hooray!