In cases of necessity, there is nothing wrong with the pilgrim in ihram wearing a mask such as if he has an allergy in his nose and he needs to wear a mask.

There is nothing wrong with the pilgrim in ihram bathing or washing himself. With regard to shampoo, it seems that its scent is not perfume; rather it is a scent and fragrance that is well liked.

It is better not to pin the rida (upper garment); rather one should wear it over his shoulders. But if he is a cook or a coffee seller and the like and wants to pin the ihram together, there is nothing wrong with it.