The Beauty Lash Power-Brow Tinting Kits have an allergically potential like all other oxidant tints which are used e.g. for dyeing hair. That is why we always recommend to do a skin test 72 – 48 h before tinting the eyebrows. If you think you have developed an allergy to tints, we recommend to see a doctor and to do a patch-test before the next treatment is done. Further, as a manufacturing company we don’t have the necessary medical knowledge and we therefore can’t give any medical advices.