Allergic reactions to hair color
Allergic reactions caused by hair coloring products can be classified into immediate hypersensitivity reactions and delayed hypersensitivity reactions. If you experience changes in your physical condition such as the following symptoms during or soon after application of hair color, you may be having an allergic reaction caused by a hair coloring agent. Seek immediate medical attention.
Immediate hypersensitivity reaction
Symptoms begin to appear during application or within about 30 minutes after applying hair color
Examples of symptoms: shortness of breath, feeling ill, dizziness, loss of consciousness, and skin abnormalities including severe itching, redness, and hives
Delayed hypersensitivity reaction
Symptoms are most severe about 48 hours after applying hair color.
Examples of symptoms: itching, redness, swelling of your face, bumps, etc.