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Hi. Welcome to JustAnswer. My name is Uzair.I am reviewing your post and will get back to your reply momentarily.
Can you attach a photo of the affected area here?
Do you have any pain within ear or any discharge?
Sore throat, cold, tooth infection?
Okay, then the most probable cause is folliculitis or a boil in formation, where the hair follicle or a sebaceous gland gets infected and inflamed. Another cause is a lymph node (post auricular node) inflammation but that does not happen without a precedent of ear infections, mastoiditis etc.
I would however, suggest that if the pain increases in intensity and the swelling becomes hot and tender, then you should see your doctor in the Urgent Care or the ER for an examination and to lance the lesion and drain the pus, i.e., if this is a boil or folliculitis.
For the pain, I would recommend that you get an anti inflammatory medication like Advil or Motrin 400 mg and take one thrice a day.
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Please let me know if you have followup questions.