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Year : 1991  |  Volume : 57  |  Issue : 4  |  Page : 202

Comedo naevus on thumb

Correspondence Address:
T J Jaisankar

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Source of Support: None, Conflict of Interest: None

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How to cite this article:
Jaisankar T J, Baruah M C, Garg B R. Comedo naevus on thumb. Indian J Dermatol Venereol Leprol 1991;57:202

How to cite this URL:
Jaisankar T J, Baruah M C, Garg B R. Comedo naevus on thumb. Indian J Dermatol Venereol Leprol [serial online] 1991 [cited 2020 Aug 11];57:202. Available from:

To the Editor

Comedo naevus, an uncommon skin dis­order, was first described by Kofman in 1895.[1] In 1896, it was described in British literature as 'Naevus acneiformis unilateralis' and in French literature as 'Naevus acneique unilat­eral on bandes et en plaques (naevus a comedons).[1] It is a developmental abnormal­ity characterised clinically by numerous kera­tin-filled pits and is generally assumed to be of pilosebaceous origin. But reported occur­rence of such lesions in palms, soles and glans penis speaks against such theory. The present report is of a case having comedo naevus on the palmar aspect of thumb, a non-pilosebaceous area.

A 25-year-old male presented with scaly pits on his right thumb since birth. The lesions were numerous closely-set pits with dark ke­ratinous plugs [Figure - 1]. Skin biopsy [Figure - 2] showed diffuse hyperkeratosis and acanthosis with deep and wide keratotic plugs. No pilosebaceous elements were seen nor were there any eccrine sweat glands or ducts be­low the lesions. Based on history, clinical features and histopathology, a diagnosis of naevus comedonicus was made.

There are various views regarding the origin of comedo naevus. The common pre­sumption is that these naevi are pilosebaceous in origin.[1] Some authors who reported these lesions in areas like palms,[1] soles and glans penis where we do not nor­mally see pilosebaceous structures thought that naevus comedonicus originates from la­tent embryonic foci and constitutes a hamartoma. Others feel that these naevi may have a sweat-duct origin .2 In our case too, a hamartoma is the only possible explanation of its origin.[2]

  References Top

1.Wood MG and Theu MA: Naevus comedonicus, Arch Dermatol, 1968; 98: 111-115.  Back to cited text no. 1    
2.Marsden RA, Fleming K and Dawber RPR: Comedo naevus of the palm - a sweat duct naevus? Brit J Dermatol, 1979, 101: 717-722.  Back to cited text no. 2    


[Figure - 1], [Figure - 2]


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