Hydroxypropyl Bis(n-hydroxyethyl-p-phenylenediamine) Hcl is best approached with caution because concentration, product format, exposure area, or personal sensitivity can materially change tolerance. Its presence alone cannot determine whether a complete product will suit you.

Check the complete ingredient list and product directions. Patch test when appropriate, and stop using a product that repeatedly causes burning, itching, or worsening symptoms.