Dermatitis: This encompasses several conditions where the skin becomes inflamed, causing redness, itching, and sometimes blistering or scaling. Contact Dermatitis: Caused by direct contact with an allergen or irritant, such as poison ivy, chemicals, or certain fabrics. Eczema (Atopic Dermatitis): A chronic condition that can cause itchy, inflamed patches of skin, often with a genetic component. Seborrheic Dermatitis: A common condition that causes scaly patches, usually on the face, scalp, and chest.

Hives (Urticaria): Raised, itchy welts that can be caused by allergies, infections, or other factors.

Psoriasis: A chronic condition that causes red, scaly patches with silvery scales.

Viral Infections: Some viral infections, like shingles (a reactivation of the chickenpox virus), can cause painful, blistering rashes.

Bacterial Infections: Cellulitis, a bacterial skin infection, can cause redness, swelling, and pain.

Medication Reactions: Some medications can cause a widespread rash.

Rash spreads rapidly or appears suddenly: This may indicate a serious allergic reaction or infection.

Rash is accompanied by fever, difficulty breathing, or other concerning symptoms: Seek immediate medical attention.

Rash is painful or shows signs of infection (pus, swelling, etc.): This requires prompt medical evaluation.

Rash doesn't improve with over-the-counter treatments within a few days: See a doctor to determine the cause and appropriate treatment.