Many systemic diseases express symptoms through the skin such as measles, and rubella, but these are not categorised as dermatoses.
Skin diseases, or dermatoses, include, skin cancer, eczema, psoriasis, acne, impetigo, scabies, sunburn, warts, Skin Tags, fifth disease(also called erythema infectiosum or "slapped face disease"), tinea, herpes, ulcers, and pruritis.
Some skin disorders are caused by absorption of material through the skin. Failure to use proper skin protection (gloves, aprons, overalls etc.) can result in irritation or even poisoning.