My guess, Andrea, is that Monty has had mites for a long time and is/was very heavily infested.. the bumps and wounds look like they may be damage from the mites, although mites weaken the immune system so he may be suffering from another illness or internal parasites as you suggested. I have forgotten - do you know if Monty was CF or CB or WC? My guess is CF - our little females were CF (which basically means that their mother was taken from the wild while pregnant, and the babies were sold in captivity - I do not generally agree with CF or WC, but our little ones were to be sold anyway that I wanted to give them a good home..),. one died and the other is doing really well now, but she did have mites, and with CF and WC there is a greater risk of external and internal parasites. Good luck at the vets on Monday and with the mite treatment. A vet is your best bet at this stage for poor Monty, and hopefully he/she can help to identify the lump/dent on Talyn. We are all here supporting you - think positive,. Monty and Talyn will be ok and the problem of mites will be long behind you sooner than you know it!