Urticaria skin darkening can be recovered, but the time needed for recovery is usually longer. Ordinary urticaria in the cure generally does not leave the pigmentation of the skin black, but pigmented urticaria is due to the release of various mediators by the mast cells caused by the skin reaction, in the clinic is usually manifested as a red or brownish-red round, oval plaques and plaques lesions, due to the pigmentation of the increase in color will lead to the gradual deepening of the color. After pigment urticaria is cured, the melanin will be gradually absorbed and dissipated with time, the absorption speed is relatively slow, and there is a certain relationship with the differences in the body, if the blood circulation is better, then the absorption speed into the faster, if the blood circulation is poor, then it will take a relatively long time to recover. During the recovery period, patients need to do a good job of daily skin care, avoid eating, using some easy to induce allergy food and substances, to prevent friction and stimulation of the skin to prolong the recovery time of the lesions.