Hi Anubhav, You seem to have developed superadded bacterial infection over your chicken pox lesions that is fluid filled lesions over your face that were of chicken pox got infected and developed pus. This could have been prevented if you had taken oral antiviral and an oral antibiotic apart from calamine and neosporine. For your spots, deriva as such would work however i would like to prescribe a stronger retinoid like retino A 0.05% to be applied only over your spots in the night judiciously as too much application can irritate your skin. Use a tooth pick to apply the medicines over your spots. Use a good sunscreen in morning and take a vitamin C supplement available in tablet form daily. Do this for a month, it will help you. If this doesnt yield much response options of peels, microdermabrasion, lasers can be discussed with your dermatologist. Take care