With what nail changes does this pencil suit, and when is a doctor needed? — Repel myco clean anti-fungal nail pencil 3ml – Juvapharma

The card does not list the nail changes for which the pencil suits. The main description says that with regular use it helps to improve the look of a damaged nail; the short description calls the product intended for the treatment and prevention of nail fungus, but the card gives no confirmation of a therapeutic effect. Warnings: for external use only; do not use in case of hypersensitivity to the ingredients; if allergic reactions appear, stop use and consult a doctor.

General information (not a manufacturer's instruction): in case of pain, inflammation, spread of changes to the skin or no improvement, a doctor's consultation is needed.