AIMS: To document the role of striae distensae and striae gravidarum in causing 
Koebner phenomenon in cases of vitiligo, psoriasis and lichen planus.
RESULTS: Striae are documented to cause Koebner phenomenon in patients with 
preexisting vitiligo, psoriasis and lichen planus, the three conditions where 
'true kobenerisation' has been suggested according to Boyd and Nelder 
classification.
CONCLUSIONS: Striae distensae and striae gravidarum are examples of blunt 
trauma. Just as happens with penetrating trauma, striae too are shown to be 
responsible for causing the Koebner phenomenon.