If you are allergic to penicillin are you allergic to blue cheese since it contains mold?

No, being allergic to penicillin does not mean you are allergic to blue cheese. Penicillin is an antibiotic derived from the Penicillium mold, but the molds used in blue cheese are different species. Allergies are specific to certain proteins, so unless you have a known allergy to the specific molds used in blue cheese, it is generally safe to consume. However, it’s always best to consult with a healthcare professional regarding food allergies.