Patients with a poor donor area density and a very low crown area are usually considered poor candidates for hair transplant surgery. This means that it will be difficult to achieve the desired aesthetic outcome. Some patients with certain medical conditions that affect the immune system, medications and lifestyles choices can make the likelihood of a hair transplant failing higher. An experienced surgeon can often mitigate against candidates that many may consider poor candidates for hair transplant surgery. Such surgeons would have treated patients suffering from medical conditions such as Neil Ruddock with his documented heart and health concerns. Other ‘poor candidates’ such as actor Michael Greco who had three previous hair transplants that didn’t work leaving his scalp overly sparse and scarred.