>>13943240Get a proper dermo to look at stuff like this, not some GP (or whatever you yanks call a primary care physician -- probably exactly that). A GP/PCP tends not to have the expertise to distinguish among a few dozen kinds of rashes and won't even use a dermascope, let alone request pathology samples.
Assuming the rash is local and not the result of some systemic disease, the main concern for a rash like that which isn't associated with ulcers or nodules is something like Bowen's disease (which can progress to skin cancer in a small number of cases) or superficial basal cell carcinoma, but these tend to grow very slowly and don't look like that, from what I've seen. If the rash blanches (fades when pressure is applied), it's probably just something benign like a fungal infection or dermatitis. I've had similar shit that responded well to a cream containing both clotrimazole (to kill any fungus) and hydrocortisone (to control itching/redness/inflammation). Always get such a combination unless a test confirms for sure that it isn't a fungal infection, otherwise the anti-inflammatory will feed the fungus.