Why is my dog limping with a red, inflamed lump on his back leg?

If he has swollen lymph nodes then he could have an infection or possibly lymphoma. Your vet can run blood-work and aspirate the lymph node to determine why it is enlarged. If he has an infection than he would need an antibiotic to treat. If he has a problem with a disc in his back then he would also need an anti-inflammatory and pain medications.

Thank you for using Petco Pet Education Center, formerly Petcoach! I can see the bump you are referring to in the wrist area. This can be a mass, bone cyst, fracture, or infection of the joint and is likely painful. I recommend having your dog seen by a vet as soon as possible. Your vet can take x-rays to determine exactly what is going on. i hope this helps and that all is well!

This looks like an area of skin infection. The smaller two bumps are pustules and the larger area is a pustule that has ruptured. Sometimes, if confined to a small area, these can be treated with topical antibacterial medication. If, however, it is more widespread your dog may need oral antibiotics. I hope this helps. If you have any other questions please let us know!

The fact that it is swollen with a yellow bump has me concerned that it is becoming infected. You could clean the area with a wound wash but he really should be examined and treated by a vet as he may need an antibiotic.

With this amount of pain and swelling he must be seen and assessed by a vet. A tumour or abscess may give such pain and deformity, but it is impossible to diagnose from a picture. There is no appropriate home remedies that can be recommended until the underlying cause is known and it is not fair to delay treatment in such a case

Please make an appointment to have Tammh seen by a vet as soon as possible. She is likely in pain, and may have a muscular or nerve injury, a fractured bone, a mass, or a foreign body in the leg. Your vet can assess the leg during the physical exam and may recommend x-rays to help determine the cause of Tammh’s limp. Pain medications meant for humans can be very dangerous (and even deadly) for dogs, so I do not recommend giving any to Tammh without consulting with your vet.

You should take him to the vet in order to get it checked, it could be an insect bite but it could also be something more serious such as a trauma to the elbow or even a tumor, this must be checked by your vet ASAP.