It is common for people to have acute, subacute, or chronic contact dermatitis once PPD comes in contact with their skin. The symptoms listed above do not show up immediately after the skin comes in contact with the dye. Symptoms only occur after some time (a few hours to a few days).
If the skin receives frequent exposure to PPD, the allergic reaction would become more severe over time and would last on the skin longer.
If a person develops dermatitis, they may be prone to having post-inflammatory hyperpigmentation, scarring, or hypopigmentation. Moreover, people must take note that even though their symptoms have already disappeared, it is most likely that they will be sensitive to PPD for the remainder of their lives.
Diagnosis of Allergic Reaction to Hair Dye
Allergists or dermatologists commonly use a patch test to see if there is a skin allergic reaction to PPD or other ingredients that are present in hair dye. There are two methods classified under patch testing, namely uncovered patch tests and covered patch tests.