We rescued two homeless puppies yesterday. They look to be about 2 months old. They were completely covered in fleas. We bathed them 3 times in Dawn detergent to kill the fleas. The tops of their heads are bald with thickened, bumpy skin. No other skin issues. Is the head issue probably from a flea allergy or is it probably mange? Hair is intact everywhere else. They have slept almost all day. They wake up, drink water, and go back to sleep. They ate a little puppy food last night, but none today, but they are drinking. I hope we are providing the right care. Should I use hydrogen peroxide on their heads? We’ve kept them separate from our dog because we are afraid the skin problem might be contagious.