In the country, the pollen count is higher during the day, whereas in large cities it is highest during the evening. Rain reduces the pollen count. link
Come to find out I have psoriasis caused by stress.
(Fabi once said, she had the same sympthom when she was going through Deutsch C1 Prüfung for her master degree...)
1-2. Hard water
Hard water? Different cleaning agent?
I believed too it was the water at first we installed a hard water filter and I switched to shampoo and body wash with no colors or chemicals . It helped out a lot but didn’t get rid of it totally . Btw I saw 4 dermatologists before I was diagnosed with psoriasis. All the others said it was environmental hence the changing in body products .
2. the side effects of the corona vaccine
It could be one of the very rare side effects of the corona vaccine.
Have you gone to the Frankfurt Uniklinik? Another option might be the Uniklinik in Mainz, they have a very good dermatology department. link
3. Humidity issue
Where are you from? If you come from a humid climate, it might just be the dry air.
I remember someone from Vietnam was complaining about these exact symptoms and went to the doctor. The doctor told her that it's normal because her body is trying to get used to the German climate and it will take a while.
Two major questions:
Did you move here from an country with alot higher air humidity?
Did you check the water quality of the area you live in on it's hardness?