anyone help my b/w e.s.s. has gradualy turned pink under her tummy and inside the top of her back legs also her skin is pink under her throat but under her tum and b/legs skin and feathering is pink help

This will be due to skin rritaion and the subsequent licking.  Have you noticed her cleaning herself a lot, as saliva will turn light areas pink, as will an inflamed skin turn pink under the coat.

Most often this is caused by flea alergy dermatitis, or some other contact allergy.