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Saturday 26 July 2008

Difference between polarized dermoscopy and immersion contact dermoscopy for diagnosis of seborrheic keratosis

Fig 1: clinical view of a seborrheic keratosis

Fig 2: Dermoscopic image taken with polarized dermoscopy

Fig 3: Dermoscopic image of the same seborrheic keratosis taken

with non polarized dermoscopy (immersion contact dermoscopy)

In our case milia-like cysts were better observed with immersion contact dermoscopy.

In an article published in the Archives of Dermatology in 2007 (1) , the authors showed that milia-like cysts and comedo-like openings were better visualized with non polarized dermoscopy (NPD), suggesting that NPD was more helpful for identification of seborrheic keratosis.

1: Benvenuto-Andrade C, Dusza SW, Agero AL, Scope A, Rajadhyaksha M, Halpern AC, Marghoob AA. Arch Dermatol. 2007 Mar; 143(3):329-38. Differences between polarized light dermoscopy and immersion contact dermoscopy for the evaluation of skin lesions.