A rash appears as an area of irritated or swollen skin, asserts Medline Plus. There are several types of rashes that can appear as part of an underlying condition or as a singular ailment. Rashes can emerge immediately after exposure to an irritant or over the course of several days. Scratching and persistent irritation can hinder a rash from healing. Treatment primarily depends on the cause of the rash, where testing may help elucidate unknown allergies of an individual. Always contact a doctor should a rash or unknown skin condition develop.
Itchiness
Several skin conditions and rashes exhibit itchiness as one of the most prevalent symptoms. Psorasis, for example, is a skin disease in which the body constantly generates new skin cells causing flaking, drying and insatiable itching in those afflicted with the condition. Itchiness may localize within a rash, or, in some circumstances, it may appear on the edges, as seen in ringworm. Scratching can provide initial relief but also cause complication and infection if done excessively, affirms Mayoclinic.com. The sensation to itch often comes from external triggers such as detergents or soap, which causes the release of histamine, the compound responsible for itchiness. Although itchiness doesn't necessarily indicate a serious skin rash, it often accompanies other symptoms that require immediate care.
Inflammation
Skin inflammation is a common symptom present in several types of skin rashes and conditions. Generally, any type of inflammation requires medical attention, however, if allergies or other causes normally occur, using the treatment outlined by a physician can help reduce skin inflammation and irritation. Inflammation begins in response to external agents such as chemicals and pollen, where histamine induces inflammation as part of the allergic reaction or irritation. Upon its release, this compound incites surrounding tissue to fill with blood fluids causing swelling and redness.
Bumps, Blisters and Hives
A variety of skin rashes and conditions exhibits characteristic bumps, blisters and hives on the skin. Red bumps are generally indicative of a rash but are extremely prominent in eczema, also known as dermatitis, rashes. Allergic dermatitis takes anywhere between 48 to 72 hours to appear but presents as red blotchy bumps on the skin, states the Skin Sight website. Alternately, irritant contact dermatitis emerges instantly in response to an external irritant. In this case, blistering on the skin appears filled with clear cellular fluid. In some people, hives, also known as welts, appear. An individual lesion generally last a couple of hours in response to allergies or the weather.
