Hi,Dear thanks for the query to HCM virtual clinic.
I studied your query in full details updated from you.I understood your health concerns.
Based on the query data, In my opinion the You seem to have -a Benign and a non-cancerous hard lump,as it has grown lately and is without any complaints/ or could be it may be a just
mastoid process which has grown, as the feel is hard.
Other possibility could be Congenital
Dermoid Cyst from birth,which seems to be other common possibility in your case.
I would advise you for
Second Opinion from Ent Surgeon on this for a Second Opinion, and FNAC
biopsy after USG and X-ray of this lump, would help you to resolve this query.
If it worries You Plan the surgical corrective excision with Biopsy at the earliest,if it is confirmed as post-auricular lump by doctors.
Hope this would resolve your query.
Welcome for any further query in this regard to ME.I would love to help you out.
Awaiting for any further query.
Wish you fast recovery from this intriguing health problem.
Have a Good Day.
Dr.Savaskar M.N.
M.S.Genl-CVTS -Senior Surgical Consultant