That looks like ringworm to me...and it's not very common with ANY breed of dog. See Vet if you can't get it remedied with non-scrip products within 10 days.
If you can post pics of the X-rays, please do. I'll let you know how bad they are. I cannot tell you how much pain your pup is in. Hip dysplasia pain comes from bone on bone contact. The ball is contacting the edge of the socket. If your Bulldog is limping, he's in pain. You can manage the...
Looks like the beginning of a Lick Granuloma. Wrap with Vet wrap...after applying Nustock. IOW, do what Manydogs suggested. Also, try to find the cause of the licking. Could be allergy, or anxiety...who knows.
Demodectic mange can be treated with Nexgard, monthly. It will take 1 month for all mites to die off. It will take another 5 months for hair to grow back. Build that immune system as suggested.