i had a spotty issue but it was on my legs it was not itchy and would go from red to purple-ish and then disapear.. i thought it was heat rash, dr said it was excema but while i was googling around i did come across a pregnancy rash that was on the belly, boobs and could spread and it only went away after giving birth!
try looking at this?
best bet probably is to try the cream again from the dermatologist for longer to see if it works or booking another appointment to see the dermatologist. sorry not much help
best of luck!!!