Hello,
These lesions do not sound like nummular dermatitis. To confirm the diagnosis, I suggest you to get an evaluation done form a dermatologist and get a skin biopsy done. In this a skin lesion is removed and sent to the pathologist to render a microscopic diagnosis. It will give a confirmatory diagnosis.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.