What Causes Swelling On Forehead After Taking Flucloxacillin For Allergic Skin Reaction?

Hi, I ve had an allergy to hair dye for the last 5 years, so I use pure henna powder instead. I purchase the powder from the same supplier but this time opted for a pure mahagony colour instead of the usual red I buy. I had an itchy, hot scalp the following day with redness in certain places. I visited my GP who prescribed hydrocortisone cream (and if it became worse, a course of flucloxacillin for 7 days). I took 4 tablets and my forehead is now larger than usual and it has swollen up along with a swollen nose. I stopped taking the tablets, but I have Botox injections also (last dose injected about a month ago). Can the antibiotics have caused a reaction to the Botox for my forehead and nose to swell? Any answer would be grateful. Thank you