Small scalp boils persisting for 15 days are typically caused by folliculitis (infected hair follicles) or a localised bacterial infection. To manage this safely, wash your scalp daily with an over-the-counter antibacterial shampoo or ketoconazole shampoo. Apply warm compresses to the area for 10 minutes, 3 times a day, to promote natural healing. Avoid scratching, squeezing, or popping the boils to prevent spreading the infection. Because this has lasted over two weeks, please consult a doctor. You may require prescription-strength topical antibiotics (such as Mupirocin) or oral antibiotics to clear the infection completely.