Table 1.
Description of Contact Allergies and/or Metal Exposure and Psoriasis in Patients Affected by PPP
| First Author, Year | No. of PPP Patients (M/F) | No. of Patients With Eczema (Type) | No. of Patients Improved After Allergen Withdrawal (Permanent, Partial, or Absent) | Exacerbation of PPP After Patch Test | No. of Patients With Psoriasis (Skin or Nails) |
|---|---|---|---|---|---|
| Ashurst, 1964 [1] | 43 (5/38) | 1 (nickel dermatitis), 1 irritant dermatitis |
NA | NA | 1 (skin) 6 (nails) |
| Enfors, 1971 [2] | 248 (56/192) | 38 (NA) | NA | NA | 34 (14%) |
| Thomsen, 1973 [3] | 40 (8/32) | 2 (Co) 1 (Ni) 1 (neomycin) 1 (formalin) 1 (benzyl salicylate) |
NA | NA | 12 (skin and/or nails) |
| Fransson, 1985 [4] | 7 (NA) | 1 (Co chloride, balsam of Peru, fragrance mix) | NA | NA | 60% (nails) |
| Pasić, 1989 [5] | 8 (NA) | 20% (1 patient) | NA | NA | NA |
| Nakayama, 1990 [6] | 11 (2/9) | 11 (Cr, Hg, Pt, Hg, Sn, Cu, Ni, Co, Zn) | 11 permanent | NA | NA |
| Yiannias, 1998 [8] | 21 (5/16) | 9 patients, 7 with multiple positive patch tests 4 (fragrance mix) 2 (cinnamic aldehyde) 2 (balsam of Peru) 1 (Ni) |
7 partial 2 absent (1 Ni) |
NA | 2 mild psoriasis (skin) 1 family history of psoriasis |
| Nakamura, 2000 [7] | 7 (3/4) | 7 (Ni, Co, Pt, Sn, Fe, Pa) | 2 NA | 7 patients | NA |
| Dantzig, 2003 [10] | 4 (NA) | 4 (Hg) | 4 permanent | NA | 1 psoriasis |
| Yanagi, 2005 [11] | 1 (F) | 1 (Zn) | 1 permanent | NA | NA |
| Wen, 2008 [12] | 1 (F) | 1 (Cu) | 1 permanent | Yes | NA |
| Song, 2011 [13] | 1 (M) | 1 (Co) | 1 permanent | No | NA |
| Ito, 2014 [14] | 1 (F) | 1 (Ni) | 1 permanent | Yes | NA |
| Liu, 2016 [15] | 2 (1/1) | 1 (No + Co) 1 (Ni) |
2 permanent | No | No/NA |
| Kouno, 2017 [16] | 85 (23/62) | 29 (10 Hg, 8 Ni, 8 Go, 7 Pa, 6 Sn, 5 Co, 5 Zn) 4(3 Cr, 2 Ir, 2 Mo) |
3 permanent | NA | NA |
| Misiak-Galazka, 2018 [17] | 39 (1/38) | 12 (5 Ni, 1 Cr, 2 Co, rest other allergens) | 7/9 NA | NA | 27% + 5% family history |
NA = not available; Co = cobalt; Cr = chromium; Cu = copper; Fe = iron; Go = gold; Hg = mercury; Ir = iridium; Mo = molybdenum; Ni = nickel; Pa = palladium; Pt = platinum; Sn = tin; Zn = zinc.