Hi My 1 year old has Thrush. Th medication prescribed Nystatin worked but it looks like its coming back.?

The sides of her lips are chapped/red/open. His Dr. saw this and didnt prescribe any antibiotic. But my question is: Should I use a little Iodine and apply it to the outside of her lip with a qtip???? Ive also taken the natural way and have been putting Acidophilus in his bottle two times a day. Please help if theres anything im missing!!!! And I've been boiling bottles and everyday!!!