Is this ringworm on the kitten's nose? If so, what should I do?
Yes, it should be. It's recommended that the owner treat the cat's ringworm promptly.
1: Shave the cat and treat ringworm.
Because ringworm in cats spreads quickly, owners should treat it promptly upon discovering it on their cat. Before treating the ringworm, owners should wear gloves, as it is contagious. Next, the owner should trim the fur around the affected area to make treatment easier. After trimming, apply a topical anti-ringworm spray to the affected area. Immediately after spraying, put an Elizabethan collar on the cat to prevent it from licking or scratching the affected area. 
2: Take proper isolation measures and pay attention to hygiene.
When a cat has ringworm, pet owners should isolate the cat. Cats are uncomfortable when they have ringworm and may rub against things, potentially rubbing against sharp objects. Owners can temporarily confine the cat to a cat cage. Next, owners should maintain a clean living environment for the cat. Use pet disinfectant to clean areas where the cat frequently moves, and wash and dry all of the cat's belongings before giving them to the cat.
3: Adjust your diet and supplement your nutrition
During a cat's runny nose infection, pet owners need to supplement their cat's nutrition. Providing adequate nutrition can improve the cat's overall health and help heal the ringworm. Pregnant cats also require certain nutrients, so pet owners should adjust their cat's diet accordingly. Owners can prepare fish soup, chicken liver porridge, egg yolks, beef, or chicken breast for their cats. Alternatively, pet owners can buy canned food or nutritional supplements for their cats.