The Spade Sign as a Pathognomonic Histopathologic Feature of Acne Keloidalis: Analysis of 33 Cases of Cicatricial Alopecia
June 2021
in “
Journal of The American Academy of Dermatology
”
Studysummary This study suggests that the "spade sign" is a highly specific histopathologic feature of acne keloidalis, although its absence does not rule out the condition.
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