Apparently he's allergic to almost everything on the allergy skin test. Some of it was so swollen the doctor could barely tell which was which. : r/Wellthatsucks
Using Patch Testing to Diagnose Contact Dermatitis
Paraphenylenediamine and hair dye contact allergy | DermNet NZ
Skincare For Allergic Contact Dermatitis - Sensitive Skin Beauty
Paraphenylenediamine and hair dye contact allergy | DermNet NZ
Hair Dye Allergy Test | Patch Skin Test in under 5 Minutes
13 Best Hypoallergenic Shampoos For Itchy Scalp In 2022