Many small granules on the forehead should be eliminated depending on the cause. If it is acne, you can use retinoids, if it is milia, it can be removed by a doctor or laser, if it is prickly heat, you can use glycerite, if it is eczema, you need to use glucocorticosteroids, and if it is flat warts, you can use antiviral medication to treat them. 1. Acne: Chronic inflammation of the sebaceous glands of the hair follicles due to various reasons can cause a lot of small particles to grow on the forehead. You can use topical retinoic acid ointment, adapalene gel, oral minocycline, doxycycline, isotretinoin and other drugs. 2. Corns: are retention cysts originating from the epidermis or epithelium of the appendages. Usually there is no conscious symptom, usually can subside by itself, without treatment, such as a large number of cornu rashes affect the aesthetics, by a professional doctor to remove. 3. Prickly heat: High indoor temperature, excessive sweating, and poor sweat drainage may cause prickly heat, which may also cause a lot of small particles on the forehead. You can use prickly heat powder, glycerin lotion and other drugs to treat it. 4. Eczema: Inflammatory skin reactions caused by internal and external stimuli can lead to a lot of small particles on the forehead. You can apply dexamethasone ointment, hydrocortisone ointment and other medications. 5. flat warts: caused by human papilloma virus infection, can be treated with salicylic acid, imiquimod cream.