If you have sensitive or reactive skin, caution is advised. The product contains lavender, which is an essential-oil-based aroma, and these can sometimes feel intense or cause irritation for some individuals. The source notes state clearly to avoid use on already irritated skin and to discontinue use if any discomfort appears.
To test safely before committing to a full bath, you can perform a simple patch test. Crush a very small piece of the bath bomb (about the size of a pea) into a cup of warm water. Stir until dissolved, then use a cotton pad to apply the solution to a small, discreet area of skin, such as the inside of your forearm or behind your ear. Leave it on for 5-10 minutes, then rinse. Monitor the area for 24 hours for any signs of redness, itching, or rash. If no reaction occurs, it is likely safe for you to use. It is also a good practice to ensure your skin is not broken or sunburned before bathing with any cosmetic product. As with any new personal care item, if you have a history of severe allergies, chronic skin conditions, or are pregnant or breastfeeding, consulting a specialist before use is recommended.