Are there any contra-indications (allergies or others) that would prevent anyone from enjoying a floatation bath?
There is no known contra-indication to floatation baths. Although, it is possible that sensitive or bruised skin might be irritated by Epsom salt. This is why it is best to avoid floating when you have a skin rash or an outbreak. If only a small region of your skin is affected, petroleum jelly can be applied to prevent the salt from coming in contact with the sensitive region, so the experience of floatation can remain a pleasant one.