Annular (ring-shaped) pustular psoriasis is a milder form of the disease. You might not have symptoms other than skin blisters, but it could return after you get better. Blisters appear as raised, pus-filled rings on the torso, arms, and legs. The centers of the rings heal before the edges do.
Pustular psoriasis is rare in children, but when they do get it, they’re most likely to have this type. Emotional stress tends to cause flare-ups within hours. This type of psoriasis is more easily treated with steroid creams or ointments.