Sorry to tell you this but you need to go back and see the dermatologist.
The way that this works is a bit confusing
Certainly what you are describing could be ringworm
and you were treated for both a bacterial and a fungal (ringworm) infection
and nothing happened
the spots went away on their own but left some incresed pigmentation where they were
now they are back in the same spot
and likely what will be needed at this point is a skin biopsy
as this does not appear to be fungal or bacterial
so this is now out of the realm of 'common' skin conditions and into the realm of less common conditions
some of the less common conditinos, discoid lupus for example, (not saying you have this, just using it as an example) can only be diagnosed by biopsy
and the biopsy is usually reserved for recurrent conditions that do not respond to standard treatment
it is very important for the dermatologist to see these spots while they are at their worst
and not after putting creams or ointments on them
as this confused the picture
and going to your primary doctor at this point is probably not going to help
because as primary care physicians
we know the most common causes of skin problems,
but the whole specialty of dermatology exists because there are literally thousands of possible causes for skin problems
and primary care physicians are simply not trained to pick up the less common ones... it's impossible for us to know all of dermatology
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