Duhhhh KumbeNaomi Campbell ana kichwa kibaya na nywele zimenyonyoka!!!!Tazama picha zake hapa

When extensions go wrong: Naomi Campbell displayed shocking bald patches as she holidayed in Ibiza earlier this week

Sparking concern: t Naomi could be suffering from traction alopecia - a hair loss condition caused by the overuse of extensions

Back in the day: Naomi's hair looked much healthier at the beginning of her career

And while Naomi still looked in great shape in her patterned bikini, all attention was focused on her hairline, with her exposed scalp causing concern.

This is not the first time Naomi has sparked concern with her thinning hair, with experts saying she is suffering from traction alopecia - hair loss caused by the use of extensions.

The supermodel, originally from Streatham, South London, has worn straight extensions over her naturally curly hair for a number of years.

Traction alopecia occurs when the extensions pull on the natural hair causing it to break, and usually affects the hairline just above the forehead or the sides, where the hair is weaker.

It can take between three months to a year for hair to grow back in moderate cases. 

But if the pulling continues the hair will never grow back and the only option is a hair transplant.

Stars including Paris Hilton, Victoria Beckham, Britney Spears and Alexandra Burke are all reported to have suffered traction alopecia as a result of hair extensions.

Still looking super: Naomi looked in great shape in the patterned bikini, a more revealing choice than Naomi's usual glamorous evening gowns

Celebrity hair extensions expert Tatiana Karelina, who counts famous faces including Danielle O'Hara, Stacey Solomon and Lauren Goodger among her clients, said of Naomi's condition: 'The interesting thing to note is that traction alopecia doesn't progress like other hair diseases. 

'At the initial stages it is reversible but prolonged tension may destroys the hair follicles and will not re-grow under any circumstances.

'It is unclear from the pictures if Naomi's condition is permanent but given the time that has passed since she was first spotted with this condition it is more than likely that the damage she has suffered is permanent.'

Is it my go now? Naomi looked on eagerly as preparations were made for her to go diving off the side of the ship

Taking a dip: Naomi lowered herself into the sea as she got ready for her underwater expedition

Back on board: Naomi appeared to have enjoyed herself as she got back on the vessel after the trip

Tatiana added to MailOnline: 'Hair extensions, when done properly, can give amazing results, but when done with no care for natural hair in some cases it can leave the follicles and your own hair damaged beyond repair.

'Heavy extensions can literally pull the follicles out over time, some glue extensions, tight weaves and elastic bands can create and enhance patches of baldness on the scalp. 

'Putting glue in your hair is similar to putting gum in it. It's going to be hard to get out and even with the best removers some hairs will get pulled out leaving you with broken hair, damage and in some cases balding.'

Easy rider: Naomi's boyfriend Vladislav Doronin showed off his jetskiing skills during the holiday

Cooling down: Vladimir looked back to check on his girlfriend as the pair enjoyed a quick swim