I bought a young 6 or 7week old chick on saturday (4 days ago) she was perfectly fine up untill when I went out to see her to put the chickens to bed. I notice she has a large lump below her neck on the right hand side, on her chest. She also has dirrareah. She is eating very well though and seems content. Please help. I did only notice it just then, im sure it wasnt there this morning, if it was it wasnt as noticable.