Scared parents of a 7 years old with psoriasis

[Caroline]

I have had psoriasis (inverse) since I was a kid, but took a long time to get diagnosed. My first symptoms of arthritis was my transmission from middle school to high school. Not everyone gets it, but those with nail and scalp psoriasis have a higher rate.

Well that is correct. I had a bit of scalp psoriasis, that was all, but I stepped right to the PsA.
But indeed as Matari and the others say, only a limited part of the people with Psoriasis get PsA. Better not worry too much in advance as it might never come. And if ... then there will be more than one medications.

And for last, Welcome to Psoriasis Club.
You are welcome here any time and we will try to answer your questions and think together with you if we don't know.

Caroline