PMC5327847_01
(A) A small ulcerative ulceration covered by erythematous crust; (B) first application of 70% trichloroacetic acid, frosting effect; (C) second application of 70% trichloroacetic acid; (D) no sign of dermatological lesion or tumor.
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The patient described a small crusted ulceration after each application, slight pain, and pruritus. The patient was seen 4 weeks after the last application of topical treatment with no signs of dermatological lesion on the preauricular area (Figure 1).