That looks an allergic reaction....
The only problem is that these sort of things all look alike no matter what the underlying cause is.
I would bet that the cream your GP gave you was some sort of steroid.
So. What to do?
At this point your best option to get to the bottom of what is going on would be to consult with a dermatologist in person.
After examining you she may want to do a skin scraping, some allergy testing or even a full thickness biopsy.
Once all these data are available then a directed treatment plan can be put in place.
Does this make sense to you?
I am happy to be able to help you today. If you would be so kind, please help me get credit for my efforts in answering your questions and press the excellent feedback button for this encounter. And, don’t forget, I work for tips. I would also be happy to continue to answer any more questions you have until we have resolved your concern.
Dr. Rick MD FACS