Hi, welcome to the ehealth forum and I am glad to help you.
You seem concerned by the bumps in ear canal caused by cold water swimming.
Surfer's ear is the common name for an exostosis or abnormal bone growth within the ear canal. Irritation from cold wind and water exposure causes the bone surrounding the ear canal to develop lumps of new bony growth which constrict the ear canal. The condition is so named due to its prevalence among cold water surfers. Cold water surfers experience surfer's ear at about six times the rate of warm water surfers.
The condition is not limited to surfing and can occur in any activity with cold, wet, windy conditions such as kayaking, sailing, jet skiing, and diving.
Hope this helps. Take care.
Note: This post is not to emphasise final diagnosis as the same cannot be made online and is aimed just to provide medical information and no treatment suggested above be taken without face to face consultation with health care professional.
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