Hi welcome to HealthcareMagic
No, the bump is not a cancer, it cannot develop in a day... that too, in you patient, there are less chances , cancer is seen in oldage... It may be a folliculitis
... nothing much to worry, you it will heal by itself, or else you can apply ketoconozole cream... for ear problem you need to get examined by a ENT specialist
Hope I have answered your question..