allergic reaction, irritation, dermatitis or eczema
,infection, acne or folliculitits. Are there other signs or symptoms present? In particular, eczema may present with itchy, reddened, dry skin. Allergies, stress, irritants, and genetic factors are all believed to be related to the development of this condition.
It would be best to have this evaluated by your doctor for proper management. A cpomplete medical and physical examination is needed to reach a clinical diagnosis.