Alopecia
There are many types of alopecia, each with a different cause.
Alopecia may be localized to the front and top of the head as in common male pattern baldness.
It may be patchy as in a condition called alopecia areata.
Or it can involve the entire head as in alopecia capitis totalis.
The word 'alopecia' comes from the Greek 'alopex' for 'fox.' Foxes are less furry when afflicted with a skin disease (the 'mange') which causes them to lose their hair.
When a fancier word for 'baldness' was sought, the mangy fox supplied it -- 'alopecia' or, if you wish, 'fox-mange' -- not a very positive image to associate with baldness!