A Rare Case of a Lichenoid Rash with Granulomatous Histology
Keywords:
Lichen Scrofulosorum, Tuberculid, Cutaneous TuberculosisAbstract
Lichen Scrofulosorum, otherwise known as Tuberculid, is a hypersensitivity reaction to mycobacterium
tuberculosis. It is a rarely seen pathology and it presents with a lichenoid rash and a granulomatous
picture is seen on histology.
We present the case of a 72 year old man with a background of pleural and renal Tuberculosis, who
presented with a 10 month history of lichenoid papules, widespread over the trunk and limbs. Skin biopsy
showed granulomatous inflammation. This clinical picture and histology, together with a background
of tuberculosis in the past, was highly suggestive of Lichen Scrofulosorum.
Although tuberculid occurs rarely, it may be the only marker of occult TB and which may not be discovered
otherwise. Therefore it is important that skin physicians are able to detect and diagnose tuberculid
and so treat accordingly.
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Copyright (c) 2018 K Mahmood, L Nemazee, N J Innes
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