“…What is increased are reports in the literature of new onsets or exacerbations of psoriasis. A distinction should be made in the case of psoriasis in that both new onsets of the condition and flare-ups of pre-existing psoriasis are reported for a total of 98 cases; 81 cases [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 ] involved flare-ups while the remaining 17 cases involved new onsets of psoriasis [ 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 ]. Several phenotypes have been described, such as erythrodermic, nail psoriasis, pustular psoriasis, but the plaque and guttate forms are definitely the most frequent [ 71 , 72 ].…”