hello and welcome to HCM, '
You seem to be having an acute reaction of some sort which is causing the redness
around your ear canal
Most of the time such lesions go away in a day or two without treatment or meddling the ears. If however the redness persists and it further worsens you need to consult and ENT and a dermatologist
so that a proper diagnosis can be reached and treatment initiated
take care and get well soon
Dr Sriram Nathan