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Hello. I am a Board Dermtologist Dermatologist. Is it possible to forward a photograph or two?
Do you take any oral medications?
This looks like an allergic type reaction. Probably to something you ate. I don't think topical cortisone will be enough. Unless there is a reason otherwise ( like a stomach ulcer or diabetes) I would recommend oral steroids such as Prednisone.
It may be be something you eat everyday such as a preservative. Do you have a rash on your palms?
Do any of these places have scale?
My first thought was a type of psoriasis but I did not see scale. Did you have a sore throat while you were in Poland?
OK> That last picture really helped. It looks like a somewhat unusual case of Pityriasis Rosea. This is usually not quite as dramatic as your case but much of your rash and history fits.
We do not know what causes Pityriasis Rosea, though a virus has long been suspected. It tends to stay on the trunk and occasionally the upper arms. There is sometimes a find scale at the periphery which I only see on a couple of your spots. The neck shows it is what we call Bleschko lines.
The sun will help or sun tanning booths.. The anti-histamines really do not unless there is severe itching. I would recommend a stronger topical steroid but oral steroids only if it is itching badly. In my office, I always get a an RPR test for syphilis but frankly in my rather long career, I have yet to see a positive. ( The rash can look somewhat alike)
Sun does help this condition. It usually gets worse for the first two weeks. It can last 6 weeks.
Sweating tends to bring out itching with this. Exercise would be fine.
Avoid harsh soaps.
You are very welcome. The good thing about this, is that it does go away and without scarring.
One treatment that I personally do not use is an injection of steroid. One of my colleagues does use this and claims he gets very good results with it. I am more conservative. But if it does not seem to be remitting after a month, that would be an option.
Best of luck. If you have more questions, please feel free to ask them, if you are content I would be grateful for a nice rating. You can still come back and ask questions.