Hello
From the photo, it appears that there may be a keloid scar appearing on the back of your earlobe. This may appear several months after a piercing. I have also seen ear keloids appear in patients only years after a previous piercing.
It is not entirely clear why this may happen although recent trauma to the piercing is possible. Successful treatment can be achieved by using combination laser and steroid injections to treat the keloid scar. Do see an experienced doctor for an assessment and discussion of your treatment options.
Best regards
Dr Stephanie Ho
Consultant Dermatologist