According to the NHS
Symptoms
Possible causes
scaly, itchy and red patches on skin on scalp, face and other areas of the bodyred or silver rash on scalp, sometimes with patchy hair loss
tinea capitis, known as ringwormdry, red, flaky and very itchy skin on areas of the body
eczemared, inflamed (irritated) skin; may also have blisters and cracked skin – reaction to products such as hair dye, sprays, gels or mousses
contact dermatitisred, flaky, crusty and sore patches of skin covered with silvery scales
psoriasisgreasy, yellowish crusts on baby's scalp, eyebrows and nappy area
cradle capOily dandruff tends to take the shape of big and plaque-like flakes. The scalp quickly becomes oily again. Dry dandruff is a problem for dry scalps. The flakes tend to be small and fine, and often accompanied by an itchy scalp.