im not a bunny expert but to me it seems like hes just blowing out his winter coat..........(hes not bald to the skin, just loosing like the undercoat)

many if not all husky and double coated dogs might say they dogs look like loosing chunks at one time when shedding, so it appears to be the same with Teddy and if you have not seen parasites as your bunny group told you to look for then i would not worry..........