What Causes Itchy Rashes With Swelling On The Neck?
Seems to be allergic reaction, cortisone cream & antihistaminic
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I have reviewed the attached photograph and it is looking like an allergic reaction.
If I was your treating doctor I would recommend you to apply cortisone cream on the affected areas twice daily and take tablet cetrizine 10 mg twice daily for 7-8 days.
This should resolve the rash.