If you have a hard bump under your cheek that hurts when you press it, you may have a boil or folliculitis if it is on the surface of the skin. If it is a hard bump in the tissue, it may be a lymphadenitis, and the cause needs to be clarified for targeted treatment.1. Boils: Initially, they are hard and non-volatile, and as they develop, pus heads may appear, and at this time there is pus inside, which is discharged and crusted after breaking, and can gradually heal. If there is infection or poor pus drainage, you can use ichthyolite ointment, tincture of iodine and other drugs to apply, and if necessary, seek medical attention for incision and pus drainage; 2. Folliculitis: hair follicles infected with pathogenic bacteria may appear hard bumps on the skin surface, which can be accompanied by redness, swelling, heat and pain, and the bumps are centered on the hair follicles. You can apply iodophor, povidone iodine solution to wipe the affected area, you can apply mupirocin ointment, fusidic acid ointment and other drugs to help relieve the symptoms; 3, lymphadenitis: for example, lymphadenitis of the parotid and submandibular glands can lead to hard bumps under the cheek of the patient, with pain when pressed, antibacterial drugs, antipyretic and analgesic drugs, and surgery if necessary.