Patch Testing

Patch test­ing helps diag­nose caus­es of con­tact der­mati­tis from aller­gens such as fra­grances, jew­el­ry, hair dye, lotion and cos­met­ics. Small disks will be placed on your back for a few days to see which aller­gens have a reac­tion. A pos­i­tive aller­gy result will include a raised red bump, red­ness or itch­ing where the cor­re­lat­ed disc was placed.

Sources:

Amer­i­can Col­lege of Aller­gy, Asth­ma, and Immunol­o­gy (acaai​.org)

The Amer­i­can Acad­e­my of Aller­gy, Asth­ma & Immunol­o­gy | AAAAI