Hi there and thank you for using Petco Pet Education Center, formerly Petcoach to address your concern. Based on the photos you have provided, it appears that Dudu may be suffering from a combination of skin allergies and an infection. I would recommend having a veterinarian examine Dudu so that the most appropriate diagnostic and treatment recommendations can be made. There are many medications for allergies and the veterinarian can make the most appropriate recommendations based on the examination findings. If you are unable to get to the veterinarian right away, I would recommend using the below products, which can be found online quite easily. I hope this helps! Please let me know if you have any other questions or concerns and I would be more than happy to help you further.
1. Douxo PS Chlorhexidine combination shampoo and bathe twice weekly until resolved
2. Pramosooth spray and apply to the affected areas 2-3 times per day