Inverted follicular keratosis is a rare tumor arising from the infundibulum of the hair follicle and considered to be a variant of seborrheic keratosis. It presents as a erythematous nodular lesion over head and neck more commonly in middle aged males. A case of inverted follicular keratosis is being reported in a 45 year old male.

Keywords: inverted, follicular, infundibulum, nodular.

1. Mehregan AH. Inverted follicular keratosis is a distinct follicular tumor. Am J Dermatopathol 1983; 5:467-70.
2. Spielvogel RL, Austin C, Ackerman AB. Inverted follicular keratosis is not a specific keratosis but a verruca vulgaris (or seborrheic keratosis) with squamous eddies. Am J Dermatopathol 1983; 5:427-42.
3. Armengot-Carbo M, Abrego A, Gonzalez T, Alarcon I, Alos L, Carrera C, et al. Inverted follicular keratosis: Dermoscopic and reflectance confocal microscopic features. Dermatology 2013; 227:62-6.
4. Amoli FA, Alain A, Heidari AB, Jahanzad I. Detection of human papillomavirus infection in inverted follicular keratosis lesions of the eyelid by immunohistochemistry method. Acta Med Iran 2009; 47:436-8. 
5. Larumbe A, Iglesias EM, IIIarramendi JJ, Córdoba A, Gállego M. Acral keratoses and inverted follicular keratosis presenting Cowden disease. Actas Dermosifiliogr 2007; 98:425-9.
6. Weedon D. Tumors of cutaneous appendages. In: Weedon D, editor. Weedon's Skin Pathology. 3^rd Amsterdam: Elsevier; 2010. p. 765-6.
7. Karadag AS, Ozlu E, Uzuncakmak TK, Akdeniz N, Cobanoglu B, Oman B. Inverted follicular keratosis successfully treated with imiquimod. Indian Dermatol Online J 2016; 7:177-9.

Saru Thakur

Dept. of Dermatology, Leprosy and Venereology, Indira Gandhi Medical College, Shimla,

Himachal Pradesh, India