Great topic, (as always!). I have had so many triggers which I think could all mostly be classed as some kind of trauma. Several throat infections in a very short space of time triggered my guttate psoriasis. Falling over as a child triggered the psoriasis that appeared on my elbows, knees and back. Stress triggered many, many flares. Friction can trigger my inverse psoriasis. The only thing I'm unsure of is what my initial trigger was. I have psoriasis since forever, so I have no memory of life without it. I was apparently born with "cradle cap" - whether that was actually psoriasis and had been misdiagnosed, or whether the trauma of the cradle cap on my scalp triggered my scalp psoriasis, I guess I will never know for sure.
Regarding the genetics, my understanding is that we have a genetic predisposition to psoriasis. This then needs to be triggered by something. So someone else in your family could have the predisposition but there's has not been triggered. Of course, you could also be the first one in your family with the genetic predisposition.
Very interested to hear yours and others' experiences with this, Diane! Warmly, -Catherine, Community Moderator