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Feline acne is a problem seen in cats primarily involving the formation of blackheads accompanied by inflammation on the cat's chin and surrounding areas that can cause lesions, alopecia, and crusty sores. [1] [2] [3] In many cases, symptoms are mild and the disease does not require treatment. [1]
An important infectious skin disease of cats is ringworm, or dermatophytosis.Other cat skin infections include parasitic diseases like mange and lice infestations.. Other ectoparasites, including fleas and ticks, are not considered directly contagious but are acquired from an environment where other infested hosts have established the parasite's life cycle.
Psoriasis is a common, chronic, and recurrent inflammatory disease of the skin characterized by circumscribed, erythematous, dry, scaling plaques. [97] [98] [99] Psoriasis vulgaris. Annular pustular psoriasis; Drug-induced psoriasis; Exanthematic pustular psoriasis; Generalized pustular psoriasis (pustular psoriasis of von Zumbusch)
Feline diseases are often opportunistic and tend to be more serious in cats that already have concurrent sicknesses. Some of these can be treated and the animal can have a complete recovery. Others, like viral diseases, are more difficult to treat and cannot be treated with antibiotics, which are not effective against viruses.
Psoriatic erythroderma can be congenital or secondary to an environmental trigger. [12] [13] [14] Environmental triggers that have been documented include sunburn, skin trauma, psychological stress, systemic illness, alcoholism, drug exposure, chemical exposure (e.g., topical tar, computed tomography contrast material), and the sudden cessation of medication.
The substances that may cause chloracne are now collectively known as chloracnegens. Chloracne is particularly linked to toxic exposure to dioxins (byproducts of many chemical processes, including the manufacture of herbicides such as Agent Orange)—so much so that it is considered a clinical sign of dioxin exposure.
Toxicodendron dermatitis lesions are often linear from brushing up against the plant. Causes of the Koebner phenomenon that are secondary to scratching rather than an infective or chemical cause include vitiligo, psoriasis, lichen planus, lichen nitidus, pityriasis rubra pilaris, and keratosis follicularis (Darier disease). [citation needed]
Perioral dermatitis, also known as periorificial dermatitis, is a common type of inflammatory skin rash. [2] Symptoms include multiple small (1–2 mm) bumps and blisters sometimes with background redness and scale, localized to the skin around the mouth and nostrils.