Itchy skin in the forehead area may be related to eczema, ringworm, seborrheic dermatitis and other diseases. 1. Eczema is a skin disease formed by a variety of intrinsic and extrinsic factors, the main clinical manifestations of skin erythema, papules, blisters, oozing with itching. 2. Ringworm is a fungal infectious skin disease, clinically manifested as itchy skin, as well as clear boundary lesions ring-like erythema. Because the disease is contagious, it can be spread by scratching in the body, for example, through the foot ringworm and infected chest skin. 3. Seborrheic dermatitis is a chronic inflammatory disease caused by an increase in sebum secretion, which, in addition to itching of the skin, may also appear as greasy scales or scabs. The chest and back are areas of high oil secretion, so they are also areas of seborrheic dermatitis. Due to the complexity of the cause of the disease, a doctor’s consultation is required for specific cases.