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