Cristalmina film 10 mg/g gel is a skin medicine whose active substance is chlorhexidine digluconate. Chlorhexidine digluconate is an antiseptic that is applied to the skin.
It is indicated as antiseptic of minor skin wounds and burns and as an antiseptic of the navel in newborns.
You should see a doctor if it gets worse or if it does not improve after 5 days.