Green’s Dictionary of Slang

dohickey n.2

also do-hinky, doohickey
[hickey n.2 ]

a love-bite or a pimple.

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, [US]Wentworth & Flexner DAS 154/2: do-hinky A pimple or any minor skin eruption. [Ibid.] 156/1: Doohickey A pimple or other skin eruption.