Thank you for your query.
It is possible that this might be scabies
, sometimes diagnosed by the visible little tortious lines in the skin , caused by the parasite tunneling. The problem with most rashes, if they have been present for a while and scratching has taken place, is there is secondary infection and the diagnosis is more difficult. Cortisone
might help for the itch, but will not treat scabies and can aggregate bacterial infection . For that reason I feel you should see a dermatologist
whom can examine your skin under magnification and thus diagnose and treat appropriately. I trust this information helps you.