My husband has had Alopecia Totalis since he was 16 years old. We have a 20-month-old son, and I am wondering what the odds are of him having this disease? He has plenty of hair all over, and no one else in my husband's family or mine has this condition.
There are various causes of total hair loss (alopecia totalis). You haven't provided me with any other information about other associated features your husband might have. For example, are the palms of his hands and the soles of his feet entirely normal? Does he have any areas of depigmentation in his skin? Is it possible that his parents are unknowingly related? Both dominant and recessive forms of this condition are known.
In theory, a dominant form could begin with your husband with a 50-percent risk of transmission to each of his children. If he has inherited a recessive form, then only if you were a carrier of the same gene would there be risks of having a child with this condition, which is an extremely unlikely event.