Hi Achintya. Tick control should always be prioritised as they spread many diseases. Use a spot on (Nayflee/Fipro forte plus) along with Erina EP shampoo.
Or you can use a tablet like Simparica/Bravecto. Or, there’s also an ayurvedic powder called Scooby dub-dub which has proven to give best results. https://backintheday.in/shop/scooby-dub-dub/