thank you for the query. As mentioned by the other doctor psoriasis
is a chronic skin condition, which shows waxing and waning course. the good side to the condition is you can always keep it control. there are few aggravating factors which you should be aware of. these are stress
, winters, dryness,few medications like antimalarials etc.
regarding your second query, this is a multifactorial disorder, and definitely genetics has a little role. however, you shouldn't be bothered about it a bit.
hope this cleared your dilemma.