Perforating Pilomatricoma Presenting as an Ulcer in the Helix of the Pinna

Keloid-like Pilomatricoma of the Auricle: A Case Report and Review of Literature

“…Of all the cases that we reviewed, pilomatricomas were commonly mistaken as dermoid cysts (3 cases/18.75%), followed by pyogenic granulomas and hemangiomas (2 cases each/12.5%). In our case, pilomatricoma was thought to be a keloid, similar to a case reported by Dutta et al [17].…”

“…Based on the description of lesion in each article, we found 11 cases (68.75%) that seemed to be of classic types and 4 cases (25%) of ulcerated types. In addition, 1 case was misdiagnosed as a keloid because of clinical resemblance [17], which is similar to our case. Keloid-like pilomatricoma was not clearly described, but it was characterized by excessive growth beyond the original lesion area and reported to comprise only 1.2% of all variants of pilomatricoma [4].…”

“…3 ). Five cases (31.25%) were located in the earlobe [ 10 , 12 , 13 , 14 , 15 ], followed by the helix [ 3 , 16 , 17 , 18 ] (4 cases/25%), outer ear canal [ 19 , 20 , 21 ] (3 cases/18.75%), antihelix anterior [ 22 , 23 ] (2 cases/12.5%), helical root [ 24 ], and cymba conchae [ 11 ] (1 case each/6.25%). None of those cases reported pilomatricoma on the posterior part of the antihelix as in our case.…”

“…It can have a bluish or reddish discolorization, but it can also appear as skin color or semi-transparent [ 7 ]. Perforating pilomatricoma showed ulceration on the nodule from which the inner calcified material extruded [ 17 ]. Based on the description of lesion in each article, we found 11 cases (68.75%) that seemed to be of classic types and 4 cases (25%) of ulcerated types.…”