“…Except for the expected adverse reactions, that is, contact dermatitis [ 148 , 163 – 165 ] or lymphadenopathy [ 166 – 168 ], there are some rare or even serious adverse events reported. These include urticaria [ 169 – 177 ], depigmentation [ 155 , 156 , 160 ], vitiligo [ 150 – 154 , 157 – 159 , 178 ], erythema multiforme [ 179 – 183 ], discoid lupus erythematosus [ 184 , 185 ], angioedema [ 186 , 187 ], nickel sensitivity [ 188 ], allergic contact dermatitis from dyes in wigs [ 189 ], acquired hair curling [ 190 ], hair pigmentary changes [ 191 ], psoriatic koebnerization [ 192 ], pityriasis lichenoides [ 193 ], dyspepsia [ 173 ], epidermolysis bullosa acquisita [ 194 ], and anaphylaxis [ 195 ]. In addition, there are a few reports documenting sensitization to the medical staff that handle the chemical compound [ 196 – 201 ].…”