Skin Deep - Clinical & Cosmetic Dermatology Blog

Skin Deep is a blog for dermatologists and skin care professionals with focus on theoretical, cosmetic and aesthetic dermatology. This blog is associated with ‘Dermatologists Sans Borders’ one of the largest curated groups of skin care professionals on facebook. If you are looking for non-technical information, please visit


I read an article about phototesting in PLE (BJD 2005 153, 1234) by Prof. Schornagel from Utrecht, Netherlands. Authors conclude that
  • Optimum number of exposures for phototesting is 4

  • Oberving skin reactions for a few days after discontinuation of phototesting can be informative.
Phototesting was +ve in 38 out of 40 suspected cases of PLE. When I was in Manipal, India as a post graduate, we have not succeeded in demonstrating even a single +ve response on phototesting! What could be the reason? Bad technique or dark Indian skin?

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About Me

As a Dermatologist and Informatician my research mainly involves application of bioinformatics techniques and tools in dermatological conditions. However my research interests are varied and I have publications in areas ranging from artificial intelligence, sequence analysis, systems biology, ontology development, microarray analysis, immunology, computational biology and clinical dermatology. I am also interested in eHealth, Health Informatics and Health Policy.


Bell Raj Eapen
Hamilton, ON