A blind pimple lasts 7-14 days with treatment and 2-6 weeks without it, since the lesion sits deep in the dermis with no surface opening to drain. Speed it along with a 10-minute warm compress three times daily to dilate the follicular duct, plus a microneedle patch (Rael Microcrystal Spot Cover, ZitSticka Killa Kit) overnight to deliver salicylic acid and niacinamide through the stratum corneum. Some blind pimples never form a head and quietly resolve in 3-4 weeks. For a deep, painful nodule lasting past 14 days, a dermatologist's intralesional triamcinolone shot flattens it in 24-48 hours. Squeezing extends the timeline by another 1-2 weeks and seeds a scar.