The technical term for scars is keloid scars. The mosquito bite left a scar, according to the nature, size and severity of the use of different methods of elimination. Such as the formation of simple bite of the scar, considered as pigmentation, usually a few months of time can be eliminated on its own, can also follow medical advice to use light pigmentation drugs. The scar formed after scratching can be treated by medication and, if necessary, by laser treatment: 1) the scratching causes the local inflammatory reaction to expand and pigmentation to appear after healing. If the scar is too long, laser treatment can be carried out; 3. Due to mosquito bite, a solid papule is formed locally, which develops into itchy rash after repeated scratching stimulation, or even nodular itchy rash forming a scar, timely medical treatment should be sought, and hormone ointment can be used externally, and antihistamines such as cetirizine and loratadine can be taken internally; 4. If the scar area is large and keloid is formed, glucocorticoid and vincristine topical preparations can be used application, or use X-ray radiation therapy. In addition, the scar is uneven and seriously affects the aesthetics, laser treatment can be performed to use the homeopathic energy of the laser to regenerate the skin and achieve a more ideal treatment effect. Note that patients should avoid long-term exposure to ultraviolet light after laser treatment, as well as in their daily life. Also use skin care products containing fruit acids or exfoliating products to promote the shedding of old keratin, thus helping to renew the skin, improve the phenomenon of hyperpigmentation and thus reduce scarring to some extent.