The area of the earring being sore with a bump could be an early sign of infection or reaction to the earring, esp if the ear was pierced recently. If the ear was pierced long ago then it maybe a Keloid formation. If the soreness continues for more than a day it is advisable to meet the ENT specialist
to take due medications.
I thank you for the query. I hope you found my response to be helpful and informative. I you have any additional concerns I would be happy to address them.