after applying some undiluted solution on lips which is not meant to be used undiluted, my lips peeling increased very fastly within a day to a level it was not possible for me to clear it with wet cotton.
i waited 9 days for yellow crusts to fall on their own , but they didn't so i myself took them off.
during these 9 days they smelled very bad and same like rotten garbage.
after healing of your biopsy wound , new crust will not smell i think , it is because of mixture of wound and peeling crusts they are smelling as it happened with me.