[targonrotts]

red mange aka demodex mange.
it is an oppurtunist mite that lives on the skin and when the immune system is low or stressed, it takes advantage.
when it affects a small spot, it is usually called localized. when it takes a big area it is generalized.

puppies can get demodex during stressful times such as teething, coming in heat for first time, new home,sick,low immunity/vaccines.
if a puppy gets localized demodex and goes away after a treatment-it usually resolves for good as the puppy builts his immunity.
if it gets localized and has reoccurences at later dates, genetics are suspected and should not be bred. this can reoccur after being in heat, whelping a litter,vaccines, moving, training, ect.
if it is generalized, it is much harder to treat and keep under control. definitely should not be bred and spaying is reccomended.

age is also important. a young dog under one year of age has better success rate than an older dog.

i have seen cases, especially in english and american bulldogs, where the dogs with more white have a higher affected rate and those that have had pups, have passed it down.

treatments:
localized can be treated with oxydex gel, mitaban/mineral oil solution mix(1cc to 13 cc),vitamin e, and cephalexin antibiotic.fatty acids.
aggressive localized or generalized need medicated baths of benzoyl peroxide or oxy/sulfur shampoos and mitaban dips, vitamin e, cephalexin, and in some cases, get a shot of immunoregulin to boost immune system.

before you do anything-talk to your vet.
is your dog being stressed? are you sure it is a reoccurence or can it be a ring worm?
you might need it re evaluated.
good luck!