If your feet are very irritated, cracked, or sensitive to fragrance or menthol, the product information advises patch testing first and avoiding application to damaged areas. This is because a balm containing urea, fragrance, and menthol can cause stinging or discomfort on broken skin, even though urea is included as a moisturising ingredient for rough patches.
For rough, thickened skin on the heels that is not broken, the balm can be used as part of a normal foot care routine. Massage a small amount into the dry area after washing and drying your feet. If you have deep cracks, bleeding, or skin that is oozing or very painful, do not apply the balm to those areas and talk to a doctor or pharmacist before using any cosmetic foot product. A foot balm is not a medicine.
To test your tolerance, apply a small amount to a small patch of clean skin, for example on the side of the foot, and wait to see whether any redness, itching, or stinging appears before using it on larger areas. If you already know you react to menthol or fragrance, this product may not be the best choice for you.