I make a reaction to the deodorant
Bicarbonate and Palmarosa essential oil are two ingredients that are naturally very effective against the development of odor-causing bacteria, which is why they are present in many natural deodorants. It is therefore possible that your skin does not support one of these ingredients.
That said, these two ingredients can make the skin react, but are not dangerous as are certain ingredients such as aluminum salts.
One solution is to try to put only a very thin layer of product on each use so that the dose is not too large for the skin, or else to alternate with another deodorant.
If, despite this, the plaques persist, whether it is just a reaction to the product or you are completely allergic to either bicarbonate or essential oils, it is of course recommended to stop using the deodorant.
You can already apply vegetable oil under your armpits to help your skin recover.