Some of the diseases that have distinguishable skin sores are shingles, hives, psoriasis, eczema, cold sores, athlete's foot and warts, states WebMD. While skin sores may differ in manifestation, from inflammation to rashes, bumps and skin discoloration, they are often caused by infection, contact with allergens or other chronic diseases.
Shingles, or herpes zoster, and cold sores, which are caused by the herpes simplex virus are examples of viral infections mentioned by WebMD. Painful blisters appear on the trunk or buttocks with shingles and on the mouth or nose for cold sores.
Eczema is another skin condition characterized by inflamed skin that is dry, red and itchy, according to WebMD. Doctors don't know the exact cause of eczema but attribute its breakout to skin irritants, allergens, climate and stress.
Von Recklinghausen's disease is a genetic disease that causes a person to develop skin sores, states Healthline. The skin may get tan spots called café-au-lait macules, freckles under the arm or groin, and neurofibromas or tumors on peripheral nerves or nerve bundles. Other serious diseases that cause skin sores include skin cancer and lupus.
Diseases causing skin sores may be contagious, particularly those due to infection, such as shingles, cold sores, athlete's foot and warts. Individuals with these problems are usually advised to avoid contact with other people to prevent the spread of the condition. Other skin problems are not contagious at all, such as eczema, acne and pityriasis rosea.