By Gary M. White, MD

Cydnidae (burrowing bug) insects some of them stink bugs release an odorous substance that serves as self defense. It can cause paralysis in prey and act as a danger signal. When it comes in contact with human skin, it can cause pigmented macules within minutes.


Red-brown pigmented macules are found at the sites of contact with the fluid. They appear streaky or have tapering edges. Their appearance is rapid. Older lesions may look like lentigines. They are more common in the rainy season.


Brown macules on the sole of a child. JAMA Derm 2015;151;232-33
Brown orange stink bug stains


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