I will post pictures later - husband has some strange way on his computer.
Three days ago, a family member noticed a pretty large asymmetrical bald spot on my almost six year olds son's head. It occurred in a matter of days (perhaps three). The spot looks identical to a lot of your pictures on here. It is completely bald and smooth to the touch. I am pretty sure he has alopecia. His hair is a bit coarse as well. It is a strange texture but people said it's just typical thick hair. Perhaps it's something else but the patches really look identical to yours. My son doesn't pull his hair. I don't think he has been through a lot of stress. This did occur during our visit with family members but he seemed to be having fun. He doesn't have ringworm.
The strange thing is that I have been losing my hair as well (35 years old) and noticed it about a month ago. I think it has been happening for a while now but I just noticed it (before this happened to my son). It is more like male pattern thinness combined with slightly excessive hair in other places where men get it as they become older. Endocrinologist thinks that it is an androgen issue than may not show up on testosterone tests (mine is normal). In a few days I will be taking a pill to help with that along with those "rogaine" pills (forgot the technical name). I went to the endocrinologist regarding this only 1 1/2 ago again before I noticed this with my son - probably before he even had it.
It's so strange that my son is now having patches of baldness and I am having hair loss. Very strange. There is no history of Alopecia.
I am taking my son to a dermatologist NP tomorrow (impossible to see the doctor on first appt). I am hoping for answers