I recently got a lovely wee 4yr old SB mare, and this is our first spring together... she is malting her winter coat off, and recently I've noticed that she's lost, or is losing hair over her face, under her tail, and in a couple of other areas. Every day, the loss of hair on her face is worse, and she looks so odd now.
Is this a seasonal 'spring' thing? Has anyone else experienced this type of malting before? I first thought it was her bridle rubbing her face, but its happening in parts that her bridle doesn't even touch.
This is a pic of her back legs a week ago. I'll try to get some pics of her face this weekend.

Her face only started missing a bit near her star and now most of her muzzle and lower face region has lost hair.
Should I be worried? She is otherwise healthy, and my only thought is it's an allergic reaction to something.
Thanks in advance.
x