Use Venky's Furfree shampoo and if the infection is more severe then use Notix Forte talcum powder after shampoo. If you want to use an Ayurvedic method to cure this then one shampoo that is said to be very effective is Notix Green shampoo which is a neem based daily shampoo. The like for this product is: https://www.petcareindia.com/p roducts_f.htm.
I use a clicker to teach sit, stay and leave command. It's a reward based training. Pick up a clicker and treats small enough for puppy to be devoured quickly. If you don't have a clicker then simply use word 'yes' the moment the puppy exhibits the requested behaviour.
There is ample resource on internet for these commands.