Skin problems, Dermatitis, Eczema Erythema, skin lesions or the common rash are terms that describe skin characterised by one or more of the following symptoms: inflammation, redness, swelling (skin edema), itching and dryness, crusting, flaking, cracking, oozing, blistering, or bleeding. Causes are as varied as the rashes themselves. They may be associated with allergies or asthma, Psoriasis, Impetigo, Shingles or rashes caused by childhood diseases like chickenpox, measles and scarlet fever. Some medications can cause rashes, as can insect bites and stings.