Looks like benign swelling..
Has to be evaluated,
U didn't mention the size ,
Hardening could be due to improper drainage of pus and usage of antibiotics...
If u want can be removed for cosmetic purposes ...
No need to worry..
Indication for Surgery: if the size of swelling is increasing day by day,
If associate with pain and discharge,
If infected,
Cosmetic purpose.
Next Steps
consult a local surgeon or general practitioner..
let him examine the swelling and come to a conclusion...
Health Tips
the swelling seems benign if want it can be removed for cosmetic purposes