Hi!, Welcome to Healthcaremagic forum, The condition what you have is known as Prurigo simplex,where in one gets itchy skin spots on the legs following a mosquito bite. If the itching has stopped and the marks are left behind then you can use hydroquinone cream (4%) at night or tretinoin cream (0.05%) at night . Chemical peels would not have any effect on the marks .It is usually good for face and not for legs. But you can try lasers on these spots .The best would be Q-Switched Nd:yag laser for the same.Kindly consult a competent dermatologist who has good experience on lasers. Hope I ve answered your query. Regards, Dr.Bharat chawda Senior specialist, Dermatology.