Localized sarcoidosis in an old tattoo: Illustrating the principle of locus minoris resistentiae

We present a case of a 33-year-old man with history of systemic sarcoidosis who presented with firm papules within multiple old tattoos. Pathology of one lesion revealed granulomatous infiltration consistent with sarcoidosis within an old tattoo. The patient was also found to have erythema nodosum, hilar lymphadenopathy, and arthralgias, and was diagnosed with Lofgren syndrome. This case of cutaneous sarcoid manifesting in an old tattoo illustrates the principle of locus minoris resistentiae (LMR).
Source: Journal of the American Academy of Dermatology - Category: Dermatology Source Type: research