Bruised blood in the nails will recover when it turns black. Bruising in the nails is mainly related to trauma, such as rupture of capillaries underneath the nails due to crushing by heavy objects or car doors. The stasis in the nail does not subside slowly and spontaneously, but gradually moves to the tip of the nail as the nail grows, and eventually falls off gradually as the nail falls off, and the nail shape returns to normal, a process that usually takes 2 to 3 months. The recovery time for fingernails is relatively quick compared to the recovery time for toenails. Nails with stasis take a little longer to recover and require patience while reducing irritation to avoid repeated episodes of stasis. It is recommended to take care of the area in general to avoid re-squeezing.