An allergic reaction to hair dye may present with itchy, red, swollen areas of the scalp. The scalp also might develop blisters that may grow, break, seep, and crust over.
An allergic reaction to hair dye may appear as a rash on the skin. There could be redness, inflamation and even blisters. Before hair dye is used it should be tested on a small area prior to dye the entire head.
The allergic reaction to hair dye is manifested differently in different people. Usually it could be in the form of rashes on the face and back side of neck