Cydnidae (Burrowing Bug) Pigmentation in a Non-Acral Site: Clinical and Dermoscopic Features

Cydnidae can cause transient cutaneous pigmentation through defensive secretions.We report a case of 24-year-old woman who presented with suddenonset asymptomatic brownish-black macules on the gluteal region following seaside exposure.The lesions were non-blanching and resistant to cleansing; dermoscopy revealed brown dots and irregular linear structures with superficial light-brown amorphous pigmentation.The pigmentation resolved spontaneously within one week, consistent with pigmentation caused by burrowing bugs.Awareness of this rare, self-limiting condition at atypical sites may prevent unnecessary diagnostic procedures.