The symptoms of a hair dye allergy

When your skin comes into contact with p-phenylenediamine PPD (or PTD) you can see the following symptoms:

Eczema. This does not have to be limited on the scalp, it can also occur in other places such as the hands or, for example, on the back.
Irritated painful scalp during and after coloring
Itching on the scalp
Bumps. Small red bumps that can be very itchy
Tearing eyes. Thick red eyes after or during a color treatment
Odeem. You can get a bloated head or hands
Reactions to the paint seem to be getting worse