Ok so I know my chickens are a little sick since their egg laying has dropped from and average of 15 to now just 10 a day, also their eggs have been loosing their color some of them are almost white now, even tho they are brown egg layer, first I thought it was lice but they have been treated and no improvement. Also almost half of the eggs that I get have a regular shape but in the middle of the egg shell feels like a bump that goes around the egg like a ring, I wanna know if anybody has seen this before, could this be a sing of worms, help would be greatly appreciated, Thanks.