My baby had this sore and red cheek again last time. I went to PD, he's given a steroid cream and its healed after 4 days of using it, but I heard steroid can make the skin thinner, do you have any suggestion of what to put on his cheek?

I always apply breast milk to my daughter's cheek when she scratches herself and it seems to heal very quickly. However, I've also heard that breast milk might cause the child to have milk rash. How about Physiogel AI cream? It's made for sensitive skin, though you should still do a patch test.