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Bald patch: Naomi Campbell revealed signs of serious hair loss on a fashion photoshoot in New York today
DailyMail.co.uk: Her wild behaviour is often shocking, but Naomi Campbell caused jaws to drop for entirely different reasons today.
The supermodel left onlookers stunned as she revealed a huge bald patch beneath her long luscious wig while on a fashion shoot for designer Dennis Basso in New York.
The 40-year-old has revealed signs of a vanishing hairline before, but the true extent of the problem was put on show as she held her hair back as a stylist adjusted her clothing.
It appears that years of wearing tight hair extensions have taken a toll on the model's natural hair, causing severe breakage.
Hair loss associated with hair braiding, weaving and extensions is known as 'traction alopecia'.
Quick fix: A hairdresser was on hand to attend to her mane
Britney Spears, Paris Hilton, Victoria Beckham and Alexandra Burke are all reported to have suffered similar symptoms as a result of their extensions.
While prolonged traction can cause permanent loss of hair in the affected areas, it is reversible if caught early.
Trichologist to the stars Philip Kingsley said tight hair styles, pony tails, hard brushing and hair extensions could all lead to traction hair loss.
'The old-fashion hair extensions were put in by weaving threads which had hairs attached to them between the natural hair,' he said.
'They were weaved next to the scalp and tightly knotted at each end to secure them.'
She's pumped: Naomi posed up at a petrol station in the Meatpacking district
'Because of their proximity to the scalp, the thread, which the hair knotted onto it, rubbed on the scalp, caused irritation, consequently making it sore and sometimes breaking the skin.'
He said the new way to put in hair extensions, which involves glue-heating them onto natural hairs, could cause similar problems.
'The biggest potential problem is traction hair loss and breakage because of the pulling involved.'
But Naomi appeared oblivious to the revelation as she posed at a gas station in the Meatpacking district.
She wore a green swimsuit that put her long, lean legs on show and also paraded a series of fur coats.
The former Peta campaigner famously declared in the Nineties that she would rather go naked than wear fur but she had a change of heart some years back.