Thanks for posting your query at DoctorSpring.com
Thanks for your questions, here are the answers:
1. You cannot do anything! Cryotherapy results in the caurerization of the base so that there is now scar formation over the area. In the initial stages, the scar is immature meaning it is reddish but with time as it spontaneously becomes mature the color will fade to close to normal.
2. Around 4-6 months. However, complete fading will take around 1 year. This is the typical time taken for an immature scar to be completely mature.
3. Yes, seems there is a little bit of infection but it is restricted to the blister ( it is difficult to comment since the picture appears too hazy). The granulation tissue is angry looking and if it bleeds to touch then there is a focus of infection. However, this requires only dressing with an antibiotic ointment as of now.
4. Not really. Just wash the area daily with soap and water and keep applying antibiotic ointment (like Mupirocin) twice daily, it should heal by itself.
Feel free to discuss further,