Treatment For Spotted Pigmentation On Neck While Having Dyskeratosis Congenita

My dad has Dyskeratosis congenita, he was diagnose with DC when he was 17 and is now 47. Doctors say that he has lived longer than most because of his healthy eating and gym lifestyle. But his vision is getting worse due to his bone marrow not producing blood cells and the spotted pigmentation is coming and going on his neck again. I know the life expectancy is usually between 24-30 and he's lived up to the age he is, but should i start being a little concerned now and should I get some test or blood work done myself?