Reaction to a bite – extremely swollen foot!

Patient: HiI have been bitten by something on my feet, it happened on Sunday but… My left foot is slightly swollen and my right foot is twice the size.There is a white ring on my leg as the swelling increasing up my leg but my foot has started to change colour.It’s painful to walk on and extremely itchy/uncomfortable in general… I do have a doctors appointment tomorrow, but is there anything I can do now?Toni

Symptoms: Itchy, aches, swollen, colour change in skin, allergic reaction

Images:
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Doctor: