Contraindication is the usual term for that.
Yes, Onychoptosis is a contraindication to a manicure and a pedicure. Anything which prevents you from carrying out a treatment in the normal way, is a contraindication. Onychoptosis is when the nail periodically sheds, which means that while it is "shedding" you should probably not work on it, but that doesn't mean you can't work on the other nails.
It is a local contraindication because it is contagious.
Contraindication means that you should not do it for said reason.
Four common contraindication in make-up
yes epilepsy could be contraindication in some treatment, please check with your physician / doctor
No.
yes
contraindication
Inflammation
A contraindication in reference to steroids means a specific situation or medical condition in which the use of steroids is not recommended due to potential harmful effects or lack of efficacy. It indicates that the risks associated with using steroids in that particular situation outweigh the potential benefits.
In a medical setting a contraindication refers to a condition that serves as reason to withhold a specific type of medical treatment. An example of this would be to not give penicillin to a patient with a penicillin allergy. It would do more harm then good for their health.