Here are the photo's I tried again to post them.  Any help will be greatly appreciated.

 

 We can't see the photos - you need to upload them somewhere (either your gallery here or Photobucket -- some place like that) and then link to them in your post.

Where is the bump?  Has the vet speculated as to what it might be?

Nupe can't see the pics.

 However, since the vet's looked at the horse, it's been "down the pike" for tests and meds. the bump got bigger and is now "hard as rock", my best guess is the horse got bit by something and is having a really bad allergic reaction.

You don't say where you live, but any kind of poison spider (like a black widow) could do something like that.  Scorpions might also do that.

I know for fact there Black Widows behind the kickboards in my barn because I've seen them.  They do their best to stay out of the horses' way but I'm sure if one of my horses accidentally rolled over on a Black Widow and it got a chance to bite them in retaliation, it would.

It sounds as if the lump may end up having to be lanced by the vet.  The chances of it going away on its own are 50-50 if it is bug bite.

Generally when a horse gets kicked and receives a lump of thanks that big, the lump is soft and mushy, that's why I'm thinking some sort of critter bite.

Hope this helps:) 

I was able to see the pics now, and all I can say is OMG!!! If your vet has no idea what it is, GET A SECOND OPINION!!! You say it doesn't seem to be hurting him, but if it's still growing you need to find out what it is. Are you near a veterinarian teaching hospital? That's a good place to check. I sure wouldn't put a bridle on a horse with a bump that big, even if the headstall doesn't go over it. That's just too scary for me, I'd be on the phone to another vet ASAP.

Thank you for looking at the photo's.  I actually was on the phone with Texas A&M University Animal Hospital when I got your reply.  They are reviewing the photo's and will get back to me.  

I hope they can help.  

 YIkes! I've never seen anything like that before.  I hope A&M can get you some answers.

If it grew from tennis ball size to THAT size overnight I'd guess it's a ruptured blood vessel pooling blood under the skin... possibly from a kick or other blunt force trauma to the face. Any vet who didn't lance that "bump" to see what's in it needs to be replaced with another vet who will. Be prepared to stop bleeding if you do. ~FH 

 Thank you I am in the process of getting him seen by someone else.  I have called Texas A& M and Brazos Valley Equine Hospital.  If A & M doesn't choose to take him in then I will take him to Brazos Valley.  Thanks you for the information concerning the blood vessels and nerves being the only things on the outside of the skull;  I did not know that.  Brazos Valley Equine Hospital says there are numerous things it could be so I am hopeful we will figure it out soon.  

 

Please keep us updated. We will learn something, too.

 OK so I sent the photo's to Texas A & M University Vet Hospital and to Brazos Valley Equine Hospital.  They both responded.  It seems that it is either an abscess not picked up by the first radio-graphs and unltrasound that is associated with a tooth, or a tumor which has grown from the root of a tooth.  If it is a tumor it could be cancer.  I am going to call on Monday and try to get an appointment at Brazos Valley Equine to see the vet there called T-Bone who has done some amazing things for the show and rodeo horses in this area.  I will keep you all informed when I find out something but I think it will be the last week of December when we have the appointment.  Thank you all so much for your help and concern.  

 This is an update for those of you who responded so kindly.  Faran went to Brazos Valley Equine Hospital today.  When we first arrived they looked at the radiographs that were taken previously.  After their review they thought the problem was most likely an abscess on a tooth.  They then took their own radiographs and decided that it might not actually be an abscess so they decided to do a biopsy.  They peirced the lump in an attempt to obtain material to be biopsied.  When they pierced it lump it began to pump out blood at a very desturbing rate.  They did attempt the biopsy but because of the bleeding they failed.  They then sewed up the hole and decided to pull the two teeth that were obviously being pushed out of place by the lump.  They then laid him down with a general anesthesia and placed him on a table on his back.  Believing that the teeth would be difficult to pull they grabbed hold of the tooth and it just slipped out.  They then went after the other one and it came out even easier.  They then decided to try for a biopsy through the root area left by the extracted teeth.  They believed it would take some effort to pierce the bone to get the biopsy but the instrument slid through quite easily much to the surprise of the vet.  They got the biopsy material and put him into the recovery room.  When we left three hours later (when they were closing for the day) he was still bleeding at an alarming rate.  The plan was to give him plasma and drugs to stop the bleeding.  The opinion now is that it is some sort of cancer but we will not know for sure until the biopsy results are in next week (because of the holiday.).  He will be watched over by two A&M interns for the night and I will get a call in the morning.  After I feed my other horse I will head up there and see how things are.  

Yikes, that sounds scary. I hope the biopsy results do not show cancer. I can sympathize with you about having to leave your horse at a vet clinic. Juno had her LF coffin bone operated on to get rid of an infection, and I had to leave her at the surgery clinic for 13 days during the holidays. I was finally able to bring her home, actually a year ago today. It's frustrating to have Xmas and New Year's interfere with what is being done with your horse.

 Oh I'm sorry to hear that. I hope the bleeding is under control now and that the biopsy offers some hopeful results.  I'll be keeping you in my thoughts.

I hope it isn't cancer and pray for answers soon for you.  Be sure and let us know how it's going. 

 

I am so sorry to hear that. :(