<s>[INST] my baby 2.5 month old on exclusive breast feeding noticing white patch over tongue for 1.5 months, for which using nystatin drop but not improve rather for last 10days she developed a blackish spot 1.5x1.5cm over dorsum of left side of the tongue.what is the cause? what should i do now? [/INST] Hi, thank you for choosing Chat Doctor and congratulations. Regarding your babies white patch on tongue, have you been applying the same cream to your nipples after feed and are you feeling any itching ? If so you also have to apply the same lotion. Regarding the blackish spot on the side of the tongue its better you show to a doctor before coming to any conclusions. Hope this has been helpful to you, kindly feel free to contact again for any further queries. Kindly rate the answer if so. Take care. </s>