Can Radiesse Cause Allergy to my Face?

Because it's been months later after having your injectables, it's likely unrelated. If it were an allergic reaction, this would have occurred immediately.

I agree, an immediate reaction would be more likely if it were an allergic response. After one it is likely due to other factors, acne, chemical dermatitis. It sounds like your dermatologist is treating it successfully. Otherwise seek another opinion.

It would be very unlikely to develop an allergic reaction to a filler several months after the injection. Radiesse is made of of calcium particles which generally do not cause an allergic reaction in most individuals. My guess would be that they are unrelated.