Yes, I have read that it is common to have multiple different types simultaneously.

Yes, I have Guttate and Plaque Psoriasis

yes i've got plaque on my elbows and scalp but Guttate on rest of my body lol

Definitely!!! At 3 I was diagnosed with Guttate Psoriasis, at around 9 I developed Plaque Psoriasis, and at sometime in my teens Pustular. I was 16 when PA reared it's ugly head. At this point I am starting to get out of control - again-so I am off on a 3 hour trip to see a Psoriasis Specialist and a Rhumatologist specilizing in PA to try and get some answers. If I get any, I'll definitely post!