The condition of a pusless, very large, hard pimple is likely to be a sebaceous cyst in the area, which may occur especially after an inflammatory infection of the sebaceous cyst, and without a pus, mainly as a large localized patch of redness, which is mainly the inflammation undergoing significant changes. If over time, pus cavities below the skin tissue may appear. In this case, timely anti-infection treatment is needed to prevent the expansion of the infected area, and even the emergence of bacteremia, etc. In treatment, antibiotics are usually given orally, followed by antibiotics applied topically, and if suppuration has occurred, an incision must be made to drain the pus.