Chicken pox can leave marks on skin which can be either just pigmentation (dark spots) or it can be a scar ( indentation in skin due to deep damage). The treatment to eliminate the marks depends on whether its a pigmentation or deep scar and also on the site of skin like face,back,arms,etc.
Next Steps
I would suggest you send a detailed query with pictures showing affected areas and also mention the complete treatment you have taken for chicken pox. Once I check everything I will write a prescription for you that you can use to clear the marks.
Health Tips
Avoid scratching healed areas as this may leave more scars. All the Best. Regards Dr jeetendra Khatuja (Mumbai)