My skin is sensitive and reactive. Is this suitable, and how should I test it first?

This cream-balsam is formulated for skin that looks oily, uneven, or easily irritated by external factors like weather, friction, or styling products. However, "easily irritated" in a cosmetic sense is not the same as clinically sensitive or barrier-compromised skin. Birch tar is a potent botanical ingredient with an astringent, resinous character; while many people find it calming for surface redness and shine, others — especially those with a history of contact allergy, atopic dermatitis, rosacea, or very thin skin — may react to it.

Before using it on larger areas, do a patch test: apply a pea-sized amount to the inner forearm or behind the ear, leave it on for 24 hours (or at least overnight), and watch for redness, itching, burning, or swelling. If any of those appear, wash the area with mild soap and water and do not use the product.

If the patch test is fine, start with a very small amount on the target area once every other day. Increase frequency only if the skin feels comfortable after a week. Avoid the eye area, mucous membranes, and any broken or open skin. Stop immediately if irritation or an allergic reaction develops.

If you are under dermatological care, using prescription topicals (retinoids, steroids, calcineurin inhibitors), or have a diagnosed skin condition, ask your specialist before adding a tar-based cosmetic to your routine. The same applies if you are pregnant or breastfeeding — while cosmetic use on small areas is generally low-risk, a pharmacist or doctor can confirm it fits your personal situation.