Panniculitis often appears as deep nodules that can occur singly or affect multiple areas of the body. The nodules can be firm or soft and mobile. The lesions can eventually become cystic and ulcerate, often draining an oily, yellowish-brown to bloody discharge.
Symptoms usually begin in late puberty or young adulthood. Symmetrical thinning of hair or hair loss commonly occurs on the outer ear flaps, under the neck, on the chest, backs of the thighs, and behind the ears.
The fungal skin disease dermatophytosis has come to be called ringworm because of the appearance of the skin lesion that characteristically occurs with this disorder: a circular area of hair loss with a red, raised outer rim.
Sarcoptic mange is one of the most uncomfortable skin diseases that a dog can contract. Highly contagious, sarcoptic mange is caused by a mite called Sarcoptes scabeie var. canis and is transmissible to humans.