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Cysts can be painful and easily infected, so be sure to see your dermatologist if you have one [source: WebMD ]. Sometimes age is a factor. Some skin conditions that cause scalp sores, such as ringworm, primarily affect children [source: Berman ]. Others, such as pemphigus, primarily affect older adults [source: National Institute of Arthritis and Musculoskeletal and Skin Diseases ].
Below, you will find the most common symptoms of sores on scalp: Skin tender or even painful to touch. Swelling around the affected area. Itchiness. Changes in skin color. Pus collection under the skin. Crusting of the skin. Skin lesions â from small areas to large plaques.