Many medical conditions can cause skin rashes on the arms and legs. But a red rash confined to one arm usually indicates a local process as opposed to a widespread medical condition. Allergies, infections and contact with irritating chemicals often cause skin reactions, leading to a red arm rash.

Treatment for a rash caused by an allergic reaction may require a prescription drug. Over-the-counter medications and topical preparations can be used. A rash accompanied by breathing difficulty is a medical emergency. Identifying the source of a rash is important.

Psoriasis is a skin condition that's characterized by thick, scaly patches that are often itchy and/or painful, as well as unsightly. This is of particular concern to sufferers with psoriasis outbreaks on the face, as it may make them shy away from daily activities with friends or family.

Psoriasis is a chronic condition that causes dry, scaly, reddish areas on your skin. While it can affect numerous body parts, the scalp is a common trouble area. Psoriasis affects more than 6 million Americans, 5 percent of whom also develop psoriatic arthritis, according to the University of Maryland Medical Center.

A pimple-like rash on the face can arise with a variety of infectious and noninfectious skin conditions that affect people of all ages. In many cases, the condition resolves without treatment. For chronic conditions, doctors often recommend topical or oral medications.

Rashes are a common rite of passage during childhood. Many illnesses expose children to both fevers and rashes, though fortunately most are of no great concern beyond the need to provide immediate comfort.

Vitamin B-12 is a water-soluble vitamin belonging to the B-complex family of vitamins. Many important biological processes in your body, including red blood cell formation and nervous system function, require vitamin B-12.

With or without a rash, itchiness is the most frequently reported symptom in all of dermatology. Even when there is no rash, the possible reasons for itchiness, or pruritus, are numerous and include various illnesses and even several normal conditions and responses.

While vitamin D is most well-known for its role in calcium absorption, it also affects skin conditions, including acne and psoriasis, both of which can be caused by an insufficient amount of vitamin D.

Psoriasis, a skin condition characterized by raised pink itchy lesions that are made from buildup of dried, dead skin cells, can affect people of any age.

Rashes can be caused by many things, such as a new medication, exposure to something that irritates the skin, or an infection. In mild cases, the rash may go away on its own anyway, but when it becomes bothersome, you may not be able to wait it out.

A by-product of the petroleum distillation process, mineral oil is a common ingredient in lotions, sunscreens and other skin care products. In the United States, mineral oil with added fragrance is sold as baby oil. According to Drugs.