Anti-chafe balm is a simple product carrying a surprisingly loaded ingredient list. The category standard is beeswax for structure, coconut or nut oil for glide, sometimes lanolin for tack, and a botanical extract on top to signal that it is kind to skin. Each of those is a well-documented contact allergen.
Beeswax carries propolis, one of the more common natural sensitizers. Lanolin — wool alcohols — has sat on standard dermatology patch-test panels for decades. Coconut and tree-nut oils are an obvious problem for anyone already avoiding them at the dinner table. And fragrance, including the essential oils marketed as the gentle alternative, remains the single largest cause of cosmetic contact dermatitis.
The botanicals are the part that catches people out. Calendula, chamomile, and arnica are the three herbs a soothing balm reaches for, and all three belong to Asteraceae — the ragweed family. The sesquiterpene lactones they contain are recognised sensitizers, and they cross-react across the family. If you react to ragweed, the ingredient added to prove the product is gentle may be the one that sets you off.
This balm leaves the whole list out. Structure comes from candelilla and sunflower wax. Glide comes from olive-derived squalane and high-oleic sunflower oil. The dry, non-greasy finish comes from kaolin clay, which is where the brand name comes from. Allantoin is the only soothing agent, and it is synthesised rather than harvested, so there is no plant protein in it.
Seven ingredients. It is not the most interesting ingredient list in the category. That is the entire point.