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 your query data, In my opinion ,Dear You seem to suffer from 
AMS(Atypical Mole Synderom) or Dysplastic Neavus Mole -both these are of benign nature and would be treated just by Excision with wide Margin and don't recur.
or it could be a 
Malignant Melanoma or 
Squamous Cell Carcinoma in the dysplastic flat mole.Treatment is  ny wide excision with chemo / and if distant mets are there with 
Radiation treatment is advisable.
As the existing 
nevus mole has changed in to growing knot,You should be concerned and should have 
second opinion from Surgeon or 
Dermatologist,to investigate above causes and to plan the right treatment as suggested above.
Team of GP doctor and Surgeon and dermatologist would be needed to treat your health issue.
Hope this reply would help you to evaluate your case and treat it with your doctors in time to come.
Hope this would resolve your query and worry and 
Anxiety accompanied with it.
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