|LETTER TO EDITOR
|Year : 1991 | Volume
| Issue : 4 | Page : 202
Comedo naevus on thumb
TJ Jaisankar, MC Baruah, BR Garg
T J Jaisankar
Source of Support: None, Conflict of Interest: None
|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
To the Editor
Comedo naevus, an uncommon skin disorder, was first described by Kofman in 1895. 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). 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. Some authors who reported these lesions in areas like palms, 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.
| References|| |
|1.||Wood MG and Theu MA: Naevus comedonicus, Arch Dermatol, 1968; 98: 111-115. |
|2.||Marsden RA, Fleming K and Dawber RPR: Comedo naevus of the palm - a sweat duct naevus? Brit J Dermatol, 1979, 101: 717-722. |
[Figure - 1], [Figure - 2]