Red pimples on the scalp may be caused by folliculitis, seborrheic dermatitis and other diseases, which can be solved by general treatment, medication and other major ways to address the cause. 1. Folliculitis: red pimples on the scalp may also be caused by folliculitis, patients should avoid scratching and rubbing the affected area. For bacterial folliculitis, you can follow the doctor’s prescription of topical antibiotic drugs, such as erythromycin, mupirocin, etc.; if it is caused by fungal infections, you can follow the doctor’s prescription of topical terbinafine, ketoconazole and other antifungal drugs. 2. Acne: Acne is a chronic inflammatory skin disease of the sebaceous gland unit of the hair follicle. Common topical preparations for acne include retinoids, benzoyl peroxide, antibiotics, azelaic acid, selenium dioxide, sulfur lotion, and so on. All of these medications should be used as prescribed by your doctor. In case of red pimples on the scalp, it is recommended to go to the hospital for treatment under the guidance of a doctor.