Inflammation of the scalp can cause the following diseases: 1. Folliculitis, caused by Staphylococcus aureus and Streptococcus hemolyticus infections, is a scattered or dense distribution of follicular inflammatory papules and pustules on the scalp, and scratching can cause the pustules to break down and purulent exudate, accompanied by a certain itching or burning sensation. 2. Seborrheic dermatitis, which can appear as light red patches with greasy scales, accompanied by slight itching. 3. 3. Tinea capitis, which is caused by fungal infections such as Trichophyton rubrum, Microsporum canis, or Trichophyton rubrum, can appear as flaking or sheaths with mild itching.