Will I be allergic to botox?

A history of other allergies does not indicate that you will be allergic to Botox. It is very unusual. I have not encountered it in my practice after using Botox for the past 22 years or so. Seek an experienced provider could manage an allergy if one should occur.

Unless there is a contaminant in the diluent, there really is no risk of allergic reaction to Botox.  Allergy to Botox will result in resistance to it (meaning it will have no effect) rather than a rash or hives.  

What you are describing is 'atopy'.  Atopic patients and their families tend to have seasonal rhinitis, eczema, asthma, hives and other sensitivities.  There is no evidence that any of these conditions predisposes the patient to increased risk of allergy with any botulinum toxin.  There is also no cross reactivity between botox and allergies to any antibiotics or other orals or contacts.  Do always bring a list of your allergies to your dermatologist so she can document them in your chart.I hope this answer is helpful.Wishing you the best of luck.