Answer:
Acne, pemphigus, and ichthyosis.
Step-by-step explanation:
Acne is an inflammatory disease of the sebaceous glands, characterized by comedones and pimples, especially on the face, back, and chest, in severe cases, by cysts and nodules resulting in scarring. Pemphigus is any of several diseases, often fatal, characterized by blisters on the skin and mucous membranes. Ichthyosis is a hereditary skin disease in which the epidermis continuously flakes off in large scales or plates.
What is a disease?
A disordered or incorrectly functioning organ, part, structure, or system of the body resulting from the effect of genetic or developmental errors, infection, poisons, nutritional deficiency or imbalance, toxicity, or unfavorable environmental factors; illness; sickness; ailment.